Mark M. answered 10/01/20
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Retired math prof. Calc 1, 2 and AP Calculus tutoring experience.
f(x) = [g(x)]3
By the chain rule, f'(x) = 3[g(x)]2 g'(x).
So, f'(5) = 3[g(5)]2 g'(5) = 3(-6)2(3) = 324