Advanced Math practice question

Answer: A. 2xy

(x + y)² = x² + 2xy + y²; subtracting x² + y² leaves 2xy.

Why the other answers are wrong

B. 0

(x + y)² is not x² + y².

C. xy

The middle term is 2xy, not xy.

D. 2x + 2y

The leftover is a product, not a sum.

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