Square Root Functions Answers

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1
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Find the inverse of the function y = x2 – 12.

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Option
B
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C
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D
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2
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Find the inverse of the function y = 2x2 + 2.

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B
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C
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D
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3

-5-115

Answer not available
4

ln > [___]

Answer:

10

5

Describe the three errors.

Answer:

The student did not switch both instances of x with y; the first line should be x = y² + 12y. He used only the principal square root instead of ±. He also gave the wrong domain: because the radicand is -11x, x must be less than or equal to 0.

6

Check your answer. Did you identify these three errors correctly?

A
The student did not switch both instances of x with y. He should have written x = y2 + 12y.
B
He wrote only the principal square root instead of using the ± sign.
C
The domain is incorrect. For the radicand to be greater than or equal to zero, x must be less than or equal to zero. It should be x 0.
Option C
8

Which inequality is used to find the domain?

A
mc001-1.jpg
Option A
B
mc001-2.jpg
Option B
C
mc001-3.jpg
Option C
D
mc001-4.jpg
Option D
9

Choose the inverse of y = x2 – 10x.

Answer not available
12

Domain: x

Answer not available

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