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

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

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(x+3)^2 = fy

(-2x - 6)^2
= [-2(x+3)]^2
= (-2)^2 (x+3)^2
= 4 fy