The function f(x)=2x^3+9x^2+12x+20 is in...

The function `f(x)=2x^3+9x^2+12x+20` is increasing in the interval

A

(a) `(-infty,-1)`

B

(b) `(2,infty)`

C

(c) `(-infty,-2)cup(-1,infty)`

D

(d) `(-2,infty)`

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The correct Answer is:

C

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