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For the cubic function f(x)=2x^3+9x^2+12...

For the cubic function `f(x)=2x^3+9x^2+12 x+1,` which one of the following statement/statements hold good? `f(x)` is non-monotonic. `f(x)` increases in `(-oo,-2)uu(-1,oo)` and decreases in `(-2,-1)` `f: RvecR` is bijective. Inflection point occurs at `x=-3/2dot`

A

f(x) is increasing

B

Increasing in `(-oo,-2) cup (-1, oo) and ` decreasing in (-2,-1)

C

f(x) is decreasing

D

f(x) is constant

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The correct Answer is:
B
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