Completing The Square Answers

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1
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Given (x – 7)2 = 36, select the values of x.

A
x = 13
B
x = 1
C
x = –29
D
x = 42
2
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Compare your response with the sample response presented here. Did your explanation

A
mention the square root property?
B
say that x could also be –2?
4

.

Question illustration
Answers:
⇒ 8:8 + 2√2i
Part 2:2
5

(x + )²

Answer:

-3

6

)²

Answer not available
10

Now, write x² - 16x + 64 = -8 as (x - 8)² = -16(x - 8)² = -8(x - 16)² = -16(x - 16)² = -8

A
(x - 8)² = -16
B
(x - 8)² = -8
C
(x - 16)² = -16
D
(x - 16)² = -8
15

Question text not available

Answers:
Blank 1:0.55
Blank 2:5.45
17

x² - 5x +

A
5/2
B
5/4
C
25/4
18

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.

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.

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