Determine the difference quotient 
(h ? 0) for the function f. Simplify completely.f(x) = 7 - 2x3
A. -2(x2 - xh - h2)
B. -21x2
C. -2(3x2 + 3xh + h2)
D. -2(3x2 - 3x - h)
Answer: C
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