4x2
(2x + 2)2
4
4(1 + x)
Correct answer is D
(x + 1x + 1)2 - (x + 1x + 1)2
= (x + 1x + 1 + x + −1x - 1)(x - 1x + 1 - x + 1x + 1)
= (2x) (2 + 2x) = 2x x 2(1 + 1x)
4x (1 + 1x) = 4x + 4
= 4(1 + x)
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