Find the intervals on which each of the following functions is (a) increasing (b) decreasing
`f(x) = 2x^(3) + 9x^(2) + 12x + 15`

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1 Answers

Correct Answer - (a) `f(x)` is increasing on `[-oo, -2] uu [-1, oo]`
(b) `f(x)` is decreasing on `[-2, -1]`

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