Unit Test

Question 1

Which of the following expressions are perfect-square trinomials? Check all of the boxes that apply.

Revolt · Accepted Answer

B: 4x2 +12x + 9; C: x2 + 20x + 100

Question 2

x² - 5x +

Revolt · Accepted Answer

C: 25/4

Question 3

A student says that if 5x2 = 20, then x must be equal to 2. Do you agree or disagree with the student? Justify your answer.

Revolt · Accepted Answer

I disagree with the student. While 2 is a solution, it is not the only possible value for x. Dividing both sides of the equation 5x^2 = 20 by 5 results in x^2 = 4. According to the square root property, taking the square root of both sides gives x = 2 or x = -2. Therefore, x could be -2 as well.

Question 4

Given (x – 7)2 = 36, select the values of x.

Revolt · Accepted Answer

A: x = 13; B: x = 1

Question 5

from each side of the equation.

Revolt · Accepted Answer

72

Question 6

Write the equation so that a = 1: x2 + x =

Revolt · Accepted Answer

Part 1: -6

Question 7

The solution to x2 – 10x = 24 is .

Revolt · Accepted Answer

C: 12 or –2

Question 8

Complete the square to write 16t² - 96t + 48 = 0 as .

Revolt · Accepted Answer

B: (t - 3)² = 6

Question 9

x² + x + 49

Revolt · Accepted Answer

A: 14

Question 10

Compare your response with the sample response presented here. Did your explanation

Revolt · Accepted Answer

A: mention the square root property?; B: say that x could also be –2?

Unit Test Answers

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