### All Precalculus Resources

## Example Questions

### Example Question #1 : Determine The Symmetry Of An Equation

Is the following function symmetric across the y-axis? (Is it an even function?)

**Possible Answers:**

No

This isn't even a function!

Yes

I don't know anything about this function.

Cannot be determined from the information given

**Correct answer:**

No

One way to determine algebraically if a function is an even function, or symmetric about the y-axis, is to substitute in for . When we do this, if the function is equivalent to the original, then the function is an even function. If not, it is not an even function.

For our function:

Thus the function is not symmetric about the y-axis.

### Example Question #1 : Determine The Symmetry Of An Equation

Is the following function symmetric across the y-axis? (Is it an even function?)

**Possible Answers:**

Yes

I don't know!

No

That's not a function!

There is not enough information to determine

**Correct answer:**

Yes

One way to determine algebraically if a function is an even function, or symmetric about the y-axis, is to substitute in for . When we do this, if the function is equivalent to the original, then the function is an even function. If not, it is not an even function.

For our function:

Since this matches the original, our function is symmetric across the y-axis.

### Example Question #3 : Determine The Symmetry Of An Equation

Determine if there is symmetry with the equation to the -axis and the method used to determine the answer.

**Possible Answers:**

**Correct answer:**

In order to determine if there is symmetry about the x-axis, replace all variables with . Solving for , if the new equation is the same as the original equation, then there is symmetry with the x-axis.

Since the original and new equations are not equivalent, there is no symmetry with the x-axis.

The correct answer is:

### Example Question #1 : Determine The Symmetry Of An Equation

Is the following function symmetrical about the y axis (is it an even function)?

**Possible Answers:**

Not a function

Insufficient Information

No

Yes

**Correct answer:**

No

For a function to be even, it must satisfy the equality

Likewise if a function is even, it is symmetrical about the y-axis

Therefore, the function is not even, and so the answer is **No**

### Example Question #1 : Determine The Symmetry Of An Equation

Algebraically check for symmetry with respect to the x-axis, y axis, and the origin.

**Possible Answers:**

Symmetrical about the x-axis

Symmetrical about the origin

Symmetrical about the y-axis

No symmetry

**Correct answer:**

Symmetrical about the x-axis

For a function to be symmetrical about the y-axis, it must satisfy so there is not symmetry about the y-axis

For a function to be symmetrical about the x-axis, it must satisfy so there is symmetry about the x-axis

For a function to be symmetrical about the origin, you must replace y with (-y) and x with (-x) and the resulting function must be equal to the original function.

-So there is no symmetry about the origin, and the answer is **Symmetrical about the x-axis**

### Example Question #1 : Determine The Symmetry Of An Equation

Algebraically check for symmetry with respect to the x-axis, y axis, and the origin.

**Possible Answers:**

Symmetry about the x-axis, and y-axis

Symmetry about the x-axis

Symmetry about the y-axis

Symmetry about the y-axis and origin

Symmetry about the x-axis, y-axis, and origin

**Correct answer:**

Symmetry about the y-axis

For a function to be symmetrical about the y-axis, it must satisfy so there is symmetry about the y-axis

For a function to be symmetrical about the x-axis, it must satisfy

so there is not symmetry about the x-axis

For a function to be symmetrical about the origin, you must replace y with (-y) and x with (-x) and the resulting function must be equal to the original function.

So there is no symmetry about the origin.

### Example Question #1 : Determine The Symmetry Of An Equation

Algebraically check for symmetry with respect to the x-axis, y-axis, and the origin.

**Possible Answers:**

Symmetry about the x-axis and y-axis

Symmetry about the x-axis, y-axis, and origin

Symmetry about the y-axis

Symmetry about the x-axis

Symmetry about the y-axis and the origin

**Correct answer:**

Symmetry about the y-axis

For a function to be symmetrical about the y-axis, it must satisfy

so there is symmetry about the y-axis

For a function to be symmetrical about the x-axis, it must satisfy

so there is not symmetry about the x-axis

For a function to be symmetrical about the origin, you must replace y with (-y) and x with (-x) and the resulting function must be equal to the original function.

So there is no symmetry about the origin, and the credited answer is "symmetry about the y-axis".

### Example Question #1 : Determine The Symmetry Of An Equation

Which of the following best describes the symmetry of with respect to the x-axis, y-axis, and the origin.

**Possible Answers:**

No symmetry

Symmetrical about the y-axis

Symmetrical about the x-axis

Symmetrical about the origin

**Correct answer:**

Symmetrical about the x-axis

For a function to be symmetrical about the y-axis, it must satisfy

so there is not symmetry about the y-axis

For a function to be symmetrical about the x-axis, it must satisfy

so there is symmetry about the x-axis

For a function to be symmetrical about the origin, you must replace y with (-y) and x with (-x), and the resulting function must be equal to the original function.

So there is no symmetry about the origin, and the answer is Symmetrical about the x-axis.

### Example Question #1 : Determine The Symmetry Of An Equation

**Possible Answers:**

No

The given information does not include a function

There is insufficient information to determine the answer

Yes

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