Advanced Math practice question

Answer: A. 6x + 9

(x² + 6x + 9) − x² = 6x + 9.

Why the other answers are wrong

B. 9

This forgets the middle term 6x.

C. 6x

This forgets the constant 9.

D. x² + 9

The x² terms cancel, and 6x is missing.

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