Advanced Math practice question

Answer: A. 3

Both terms share the factor 3: 6x + 9 = 3(2x + 3).

Why the other answers are wrong

B. 2

k = 2 gives 4x + 6, not 6x + 9.

C. 6

k = 6 gives 12x + 18 — twice too large.

D. 9

k = 9 gives 18x + 27 — three times too large.

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