If y = (x + 3)2, then (-2x - 6)2 must equal which of the following? a. -4y2 b. -2y2 c. -4y d. 4y

asked Apr 5, 2016 75.7k views

2 votes

If y = (x + 3)2, then (-2x - 6)2 must equal which of the following?

a. -4y2
b. -2y2
c. -4y
d. 4y

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4 votes

$(-2x-6)^2=(-2(x+3))^2=(-2)^2 * (x+3)^2=4(x+3)^2 \\ \\ y=(x+3)^2 \hbox{ so } 4(x+3)^2=4y$

The answer is D.

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