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If f(x)=alog|x|+b x^2+x has extreme valu...

If `f(x)=alog|x|+b x^2+x` has extreme values at `x=-1 a n d a t x=2,` then find a and b .

A

a=2, b=-1

B

a=2 , `b=-(1)/(2)`

C

`a=-2 , b=(1)/(2) `

D

`a=(1)/(2),b=-(1)/(2)`

Text Solution

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The correct Answer is:
B
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