Equivalent Expressions

SAT Math· difficulty 3/5

(x + y)^2 - (x - y)^2

A
$4x^2 - 4y^2$
B
$2x^2 + 2y^2$
C
$2xy$
D
$4xy$
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Explanation

(x+y)^2 - (x-y)^2 = (x^2 + 2xy + y^2) - (x^2 - 2xy + y^2) = 4xy

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