Question

Which equations are true for x = –2 and x = 2? Select two options x2 – 4 = 0 x2 = –4 3x2 + 12 = 0 4x2 = 16 2(x – 2)2 = 0

Answer 1

2,-2,-2,2,2

Explanation:

x2 - 4 = 0

(2)(2) - 4 = 0

4 - 4 = 0

0 = 0

The answer is 2.

x2 = -4

(-2)(2) = -4

-4 = -4

The answer is -2.

3x2 + 12 = 0

(3)(-2)(2) + 12 = 0

(-6)(2) + 12 = 0

-12 + 12 = 0

0=0

The answer is -2.

4x2 = 16

(4)(2)(2) = 16

(8)(2) = 16

16 = 16

The answer is 2.

2(x -2)2 = 0

2(2-2)2 = 0

2(0)(2) = 0

(0)(2) = 0

0 = 0

The answer is 2.

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