IF f(x)=2x^3+3x^2-12x+5 , then the inter...

IF `f(x)=2x^3+3x^2-12x+5` , then the interval in which `(l_1)` increases and `(l_2)` decreases is

A

`l_1=(-infty,-2)cup(1,infty),l_2=(-2,1)`

B

`l_1=(-infty,1),l_2=(-1,2)cup(2,infty)`

C

`l_1=(-infty,-1)cup(2,infty),l_2=(-1,2)`

D

`l_1=(-infty,2)cup(-1,infty),l_2=(5,2)`

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The correct Answer is:

A

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