The monotone increasing interval of function f (x) = 2x ^ 3-3x ^ 2-36x + 16 is?

f'(x)=6x^2-6x-36
Let f '(x) = 0
x^2-x-6=0
x=3,x=-2
X3, f '(x) > 0, f (x) is an increasing function
So monotone increasing intervals (- ∞, - 2) and (3, + ∞)

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