Advanced Math practice question

Answer: A. 9x³

(3x)² = 9x². Multiplying by x adds one to the exponent: 9x³.

Why the other answers are wrong

B. 3x³

3x³ forgets to square the 3.

C. 9x²

9x² forgets the final multiplication by x.

D. 6x³

6x³ doubles the 3 instead of squaring it.

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