Given f(x) and g(x), find f(x) ? g(x).f(x) = x2 + x - 7 and g(x) = x2 - 3
A. f(x) ? g(x) = x4 + x3 + 10x2 - 3x + 21
B. f(x) ? g(x) = x4 - 3x2 - 3x + 21
C. f(x) ? g(x) = x4 + x3 - 3x + 21
D. f(x) ? g(x) = x4 + x3 - 10x2 - 3x + 21
Answer: D
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