Find the intervals in which f(x)=-2x^3-9...

Find the intervals in which `f(x)=-2x^3-9x^2-12 x+1` is increasing or decreasing.

A

`(-2, oo)`

B

`(-2, -1)`

C

`(-oo, -1)`

D

`(-oo, -2) and (-1, oo)`

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The correct Answer is:

D

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