Advanced Math practice question

Answer: A. 3h

f(x + h) = 3x + 3h − 2. Subtracting f(x) = 3x − 2 leaves 3h.

Why the other answers are wrong

B. h

h forgets the factor 3.

C. 3h − 2

3h − 2 fails to cancel the −2 terms.

D. 3x + 3h

3x + 3h is f(x + h) + 2, not the difference.

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