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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` and at `x=2` , then find `a` and `b` .

A

`a=2`

B

`b=-1//2`

C

`a=-2`

D

`b=1//2`

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