Question: Let f ( x ) = x 3 + x 2 12 x + 9. Find the values of x for which the following are

Let

f(x) = x3 + x2 12x + 9.

Find the values of x for which the following are satisfied. (Enter your answers as comma-separated lists.)(a)

f'(x) = 12

x =

(b)

f'(x) = 0

x =

(c)

f'(x) = 12

x =

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