For the given functions f and g, find the requested function and state its domain.f(x) = 7x - 6; g(x) = 3x - 9Find f ? g.
A. (f ? g)(x) = 21x2 - 81x + 54; all real numbers
B. (f ? g)(x) = 21x2 + 54; {x|x ? 54}
C. (f ? g)(x) = 10x2 - 81x - 15; all real numbers
D. (f ? g)(x) = 21x2 - 27x + 54; {x|x ? 54}
Answer: A
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