Equivalent Expressions

SAT Math· difficulty 4/5

(x + 1)^2 - (x - 1)^2

A
$2x^2$
B
$0$
C
$4x$
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D
$2x$

Explanation

[(x+1) - (x-1)][(x+1)+(x-1)] = 2 \cdot 2x = 4x

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