Comparing Functions Represented in Different Ways
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Algebra 2 › Comparing Functions Represented in Different Ways
Function $f$ is shown on the coordinate plane as a line passing through the points $(-2,-1)$ and $(2,7)$. Function $g$ is given algebraically by $g(x)=3x+1$. Which function has the greater rate of change (slope)?
Function $f$ has the greater slope (2 vs. 3).
Function $f$ has the greater slope (8 vs. 3).
Function $g$ has the greater slope (3 vs. 2).
They have equal slopes (both 2).
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given graphically via points and another as a formula—requiring you to extract the same feature from each representation and compare them.
Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values!
For function f shown as a line through (-2,-1) and (2,7), calculate slope as (7 - (-1))/(2 - (-2)) = 8/4 = 2; for function g given by g(x) = 3x + 1, the slope is the coefficient of x, which is 3, so comparing 3 > 2 shows g has the greater slope.
Choice B correctly extracts the slope from both and compares accurately, showing g has the greater slope (3 vs. 2).
A distractor like choice A might result from reversing the comparison after calculation, incorrectly claiming f has the greater slope (2 vs. 3), but ensure you identify which value is actually larger.
Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation!
Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given by $f(x)=x^2-6x+5$. Function $g$ is shown in the table:
$\begin{array}{c|ccccc}
x & 0 & 1 & 2 & 3 & 4\ \hline
g(x) & 2 & 0 & -2 & 0 & 2
\end{array}$
Which statement correctly compares the minimum values of $f$ and $g$?

$f$ has a larger minimum value than $g$ ($-4$ vs $-2$).
$f$ has a smaller minimum value than $g$ ($-4$ vs $-2$).
They have the same minimum value ($-2$).
$g$ has a smaller minimum value than $f$ ($-2$ vs $-1$).
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another as a table—requiring you to extract the same feature from each representation and compare them.
Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values!
For function f, given as f(x) = $x^2$ - 6x + 5, find minimum by vertex formula x = -b/(2a) = 6/2 = 3, then f(3) = 9 - 18 + 5 = -4. For function g, scan table values (2, 0, -2, 0, 2) to find smallest is -2.
Choice A correctly extracts the minimum from both (-4 for f from vertex calculation, -2 for g from scanning table) and compares accurately, showing f has the smaller minimum value.
A common distractor like choice D might misinterpret 'larger minimum' by confusing inequality, but since -4 < -2, f's is smaller; focus on the numerical comparison.
Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation!
Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given algebraically by $f(x)=x^3-4x$. Function $g$ is shown graphically on the coordinate plane.
Which function has the larger value at $x=-2$?
They are equal at $x=-2$ (both $0$).
Function $f$ is larger at $x=-2$ ($0$ vs $-4$).
They are equal at $x=-2$ (both $-4$).
Function $g$ is larger at $x=-2$ ($-4$ vs $0$).
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another as a graph—requiring you to extract the same feature from each representation and compare them. Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values! For function f given by f(x) = $x^3$ - 4x, plug in x=-2 to get $(-2)^3$ - 4(-2) = -8 + 8 = 0; for function g shown graphically, read the y-value at x=-2 as -4, so comparing shows f's 0 is larger than g's -4. Choice A correctly extracts the value at x=-2 from both and compares accurately, showing function f has the larger value. A distractor like choice B might come from misreading the graph's scale—ensure you align x=-2 precisely and read the corresponding y. Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation! Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given by $f(x)=\dfrac{x+4}{x-1}$. Function $g$ is described verbally as: “$g$ is a rational function with a vertical asymptote at $x=-3$.” Which function has a vertical asymptote farther from the origin (i.e., with larger $|x|$)?
They are equally far from the origin (both at distance 1).
Function $f$ (at $x=1$) is farther from the origin than function $g$ (at $x=-3$).
They are equally far from the origin (both at distance 3).
Function $g$ (at $x=-3$) is farther from the origin than function $f$ (at $x=1$).
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another verbally—requiring you to extract the same feature from each representation and compare them. Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values! For function f given by f(x) = (x+4)/(x-1), the vertical asymptote is where the denominator is zero, at x=1, so |x|=1; for function g described verbally as having a vertical asymptote at x=-3, |x|=3, so comparing 3 > 1 shows g's asymptote is farther from the origin. Choice B correctly extracts the asymptote positions from both and compares accurately, showing g (at x=-3) is farther from the origin than f (at x=1). A distractor like choice A might stem from forgetting to take absolute values or miscomparing distances, incorrectly stating f is farther, but always compute |x| for distance from origin. Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation! Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given by $f(x)=(x-2)^2-9$. Function $g$ is shown on the coordinate plane as a parabola with vertex at $(0,-4)$ opening upward. Which function has the smaller minimum value?
Function $g$ has the smaller minimum value ($-4$ vs. $-9$).
Function $f$ has the smaller minimum value ($-9$ vs. $-4$).
Function $g$ has the smaller minimum value ($-4$ vs. $9$).
They have the same minimum value (both $-4$).
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another graphically—requiring you to extract the same feature from each representation and compare them.
Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values!
For function f given by f(x) = $(x-2)^2$ - 9, the minimum occurs at x=2 (vertex), with f(2) = -9; for function g shown as an upward-opening parabola with vertex (0,-4), the minimum is the y-coordinate -4, so comparing -9 < -4 shows f has the smaller minimum.
Choice A correctly extracts the minimum from both and compares accurately, showing f has the smaller minimum value (-9 vs. -4).
A distractor like choice C could result from mixing up which is smaller, incorrectly claiming g has the smaller minimum (-4 vs. -9), but recall that more negative means smaller.
Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation!
Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given by $f(x)=-x^4+2x^2$. Function $g$ is represented graphically as a polynomial whose ends both rise (as $x\to\pm\infty$, $g(x)\to\infty$). Which statement correctly compares the end behavior of $f$ and $g$?
$f$ rises on both ends, while $g$ falls on both ends.
$f$ falls on both ends, while $g$ rises on both ends.
$f$ falls to the left and rises to the right, while $g$ rises on both ends.
Both $f$ and $g$ rise on the left and right.
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another graphically—requiring you to extract the same feature from each representation and compare them.
Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values!
For function f given by f(x) = $-x^4$ + $2x^2$, the leading term $-x^4$ indicates as x→±∞, f→-∞, so falls on both ends; for function g represented graphically with both ends rising (as x→±∞, g→∞), it rises on both ends, so they differ in end behavior.
Choice B correctly extracts the end behavior from both and compares accurately, showing f falls on both ends, while g rises on both ends.
A distractor like choice A might ignore the negative leading coefficient for f, incorrectly stating both rise, but always check the sign and degree of the leading term.
Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation!
Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given in the table:
$\begin{array}{c|cccc}
x & -1 & 0 & 1 & 2\ \hline
f(x) & -3 & 1 & 5 & 9
\end{array}$
Function $g$ is given algebraically by $g(x)=4x+1$.
Which statement correctly compares the rate of change (slope) of $f$ and $g$?
Both have slope $2$, so they increase at the same rate.
Both have slope $4$, so they increase at the same rate.
$f$ has slope $2$ and $g$ has slope $4$, so $g$ increases faster.
$f$ has slope $4$ and $g$ has slope $2$, so $f$ increases faster.
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a table and another as a formula—requiring you to extract the same feature from each representation and compare them.
Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values!
For function f, from table, calculate slope as Δy/Δx, e.g., (1 - (-3))/(0 - (-1)) = 4/1 = 4, consistent between points. For function g, given as g(x) = 4x + 1, slope is 4, so equal.
Choice C correctly extracts the slopes (4 for f by differences in table, 4 for g from coefficient) and compares accurately, showing they have the same rate of change.
A common distractor like choice A might miscalculate f's slope, perhaps using wrong points or arithmetic, but verify multiple intervals: all give 4, matching g's 4.
Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation!
Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given by the equation $f(x)=2^x$. Function $g$ is represented numerically by the table:
$\begin{array}{c|ccccc}
x & 0 & 1 & 2 & 3 & 4\ \hline
g(x) & 3 & 6 & 12 & 24 & 48
\end{array}$
Which function has the larger y-intercept?
Function $g$ has the larger y-intercept ($3$ vs $1$).
Function $f$ has the larger y-intercept ($2$ vs $3$).
Function $f$ has the larger y-intercept ($1$ vs $0$).
The y-intercepts are equal.
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another as a table—requiring you to extract the same feature from each representation and compare them.
Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values!
For function f, given as f(x) = $2^x$, find y-intercept by setting x=0: $2^0$ = 1. For function g, from the table, read g(0) = 3 directly from the x=0 column.
Choice B correctly extracts the y-intercept from both (1 for f by plugging in x=0, 3 for g from table) and compares accurately, showing g has the larger y-intercept.
A common distractor like choice A might miscalculate f(0) as 2 instead of 1, but remember exponential with base 2 at x=0 is always 1, and verify table's x=0 value is 3.
Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation!
Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given algebraically by $f(x)=\dfrac{x+4}{x-1}$. Function $g$ is described verbally as: “$g$ is a rational function with a vertical asymptote at $x=-3$.”
Which function has a vertical asymptote farther from the origin on the x-axis?
Function $g$, because $|-3| > |1|$.
They are equally far from the origin.
Function $f$, because $|1| > |-3|$.
Function $f$, because its vertical asymptote is at $x=4$.
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another as a verbal description—requiring you to extract the same feature from each representation and compare them. Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like y = mx + b shows slope m immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values! For function f, given as f(x) = (x+4)/(x-1), the vertical asymptote is where denominator is zero (x=1). For function g, the verbal description directly states vertical asymptote at x=-3; compare distances |1| = 1 vs |-3| = 3, so g is farther. Choice B correctly extracts the asymptotes (x=1 from f's denominator, x=-3 from g's description) and compares distances accurately, showing g has the vertical asymptote farther from the origin. A common distractor like choice C might confuse the comparison by saying |1| > |-3|, but absolute values make both positive, and 3 > 1, so correct the inequality direction. Property extraction by representation type: FROM FORMULA—y-intercept: set x = 0; maximum of quadratic: complete square or use vertex formula; slope: read from y = mx + b or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where x = 0 or y = 0; maximum: scan for largest y-value; slope (linear): calculate Δy/Δx between any two points. Use the method matching your representation! Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in x = 0), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.
Function $f$ is given by $f(x)=\left(\dfrac{1}{2}\right)^x$. Function $g$ is represented by the table:
$$\begin{array}{c|cccc} x & 0 & 1 & 2 & 3 \\ \hline g(x) & 5 & 10 & 20 & 40 \end{array}$$
Which function has the greater output at $x=3$?
Function $f$, because $f(3)=\dfrac{1}{8}$ is greater than $40$.
Not enough information to compare at $x=3$.
Function $g$, because $g(3)=40$ is greater than $f(3)=\dfrac{1}{8}$.
They are equal at $x=3$.
Explanation
This question tests your ability to compare function properties when functions are presented in different ways—like one given as a formula and another as a table—requiring you to extract the same feature from each representation and compare them. Functions can be represented in four main ways, and each representation makes certain features easy to see: formulas let you calculate any value precisely and see structure (like $y = mx + b$ shows slope $m$ immediately), graphs show shape and extrema visually (you can spot maximums and end behavior at a glance), tables provide exact input-output pairs (easy to read specific values), and verbal descriptions summarize key features in words. To compare functions in different representations, extract the desired property from each using the method that fits that representation, then compare the extracted values! For function $f$, given as $f(x) = \left(\dfrac{1}{2}\right)^x$, calculate $f(3) = \left(\dfrac{1}{2}\right)^3 = \dfrac{1}{8}$. For function $g$, read from table $g(3) = 40$ directly. Choice B correctly extracts the output at $x=3$ from both ($\dfrac{1}{8}$ for $f$ by exponentiation, 40 for $g$ from table) and compares accurately, showing $g$ has the greater output. A common distractor like choice A might swap the values or miscalculate $\left(\dfrac{1}{2}\right)^3$ as something larger, but remember it's $\dfrac{1}{8}$, and 40 > $\dfrac{1}{8}$ is clear. Property extraction by representation type: FROM FORMULA—y-intercept: set $x = 0$; maximum of quadratic: complete square or use vertex formula; slope: read from $y = mx + b$ or calculate rise/run. FROM GRAPH—intercepts: see where crosses axes; maximum: find highest point and read coordinates; slope: pick two points, calculate rise/run. FROM TABLE—intercept: find row where $x = 0$ or $y = 0$; maximum: scan for largest y-value; slope (linear): calculate $\Delta y / \Delta x$ between any two points. Use the method matching your representation! Quick comparison shortcuts: for y-intercepts, formulas are fastest (plug in $x = 0$), but graphs let you just read off where it crosses the y-axis. For maxima, graphs are easiest (visually find highest point), but formulas of quadratics give exact vertex. For growth rates, tables let you calculate differences (linear) or ratios (exponential) directly. Play to each representation's strengths—don't convert everything to formulas if the feature is obvious in the given form! Efficient comparison means using the representation smartly.