Algebra II : Functions as Graphs

Study concepts, example questions & explanations for Algebra II

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Example Questions

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Example Question #21 : Functions As Graphs

True or false: The graph of  has as a horizontal asymptote the graph of the equation .

Possible Answers:

False

True

Correct answer:

True

Explanation:

 is a rational function in simplest form whose denominator is a polynomial with degree greater than that in its numerator (2 and 1, respectively). The graph of such a function has as its horizontal asymptote the line of the equation .

Example Question #21 : Functions As Graphs

True or false: The graph of  has as a horizontal asymptote the graph of the equation .

Possible Answers:

False

True

Correct answer:

False

Explanation:

 is a rational function in simplest form whose denominator has a polynomial with degree greater than that of the polynomial in its numerator (2 and 1, respectively). The graph of such a function has as its horizontal asymptote the line of the equation .

Example Question #23 : Functions As Graphs

True or false: The graph of  has as a horizontal asymptote the graph of the equation .

Possible Answers:

True

False

Correct answer:

False

Explanation:

 is a rational function whose numerator and denominator are polynomials of the same degree (1). As such, it has as a horizontal asymptote the line of the equation , where  is the quotient of the coefficients of the highest-degree terms of its numerator and denominator. Consequently, the horizontal asymptote of 

is

or

.

Example Question #22 : Functions As Graphs

True or false: The graph of   has as a horizontal asymptote the line of the equation .

Possible Answers:

True

False

Correct answer:

False

Explanation:

 is a rational function whose numerator is a polynomial with degree greater than that of the polynomial in its denominator (2 and 1, respectively). The graph of such a function does not have a horizontal asymptote.

Example Question #25 : Functions As Graphs

Which of the following equations is that of an oblique asymptote of the graph of the function  ?

Possible Answers:

Correct answer:

Explanation:

To find an oblique asymptote of a rational function whose numerator has higher degree than its denominator, as is the case here, divide the former by the latter, as follows:

Division

Note that "missing" terms have been inserted in the dividend as terms with zero coefficients.

Divide the leading term of the dividend by that of the divisor:

Place this in the quotient, and multiply this by the divisor:

Subtract this from the dividend. The figure should look like this:

Division

Repeat with the difference:

The figure now looks like this:

Division

 

The difference has degree less than that of the divisor, so the division is finished. The equation of the oblique asymptote of the graph of  is taken from the quotient, and is the line of the equation .

Example Question #26 : Functions As Graphs

Which is a vertical asymptote of the graph of the function

 ?

(a) 

(b) 

Possible Answers:

Both (a) and (b)

Neither (a) nor (b)

Cannot be determined

(b) only

(a) only

Correct answer:

(b) only

Explanation:

The vertical asymptote(s) of the graph of a rational function such as  can be found by evaluating the zeroes of the denominator after the rational expression is reduced

First, factor the numerator and denominator.

The numerator is a perfect square trinomial and can be factored as such:

The denominator can be factored as the difference of squares:

Rewrite

as

The expression can be reduced by cancelling  in both halves:

Set the denominator equal to 0 and solve:

The only asymptote is therefore the line of the equation 

Example Question #27 : Functions As Graphs

Function

The above table refers to a function  with domain .

Is this function even, odd, or neither?

Possible Answers:

Cannot be determined

Even 

Neither

Odd

Correct answer:

Even 

Explanation:

A function  is odd if and only if, for every  in its domain, ; it is even if and only if, for every  in its domain, . We can see that 

Of course, 

.

Therefore,  is even by definition.

Example Question #21 : Functions And Graphs

Which of the following equations is that of an oblique asymptote of the graph of the function  ?

Possible Answers:

The graph of  does not have an oblique asymptote.

Correct answer:

Explanation:

To find an oblique asymptote of a rational function whose numerator has higher degree than its denominator, as is the case here, divide the former by the latter, as follows:

Division

Divide the leading term of the dividend by that of the divisor:

Place this in the quotient, and multiply this by the divisor:

Subtract this from the dividend. The figure should look like this:

Division

Repeat with the difference:

The figure now looks like this:

Division

The difference has degree less than that of the divisor, so the division is finished. The oblique asymptote is the quotient, 

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