Advanced Math practice question

Answer: A. 2x − 5

(2x − 5)² = 4x² − 20x + 25: the middle term is 2(2x)(−5) = −20x.

Why the other answers are wrong

B. 2x + 5

(2x + 5)² has middle term +20x.

C. 4x − 5

(4x − 5)² = 16x² − 40x + 25.

D. 2x − 25

(2x − 25)² = 4x² − 100x + 625.

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