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If f(x)=alog|x|+b x^2+x has its extremum...

If `f(x)=alog|x|+b x^2+x` has its extremum values at `x=-1a n dx=2,` then `a=2,b=-1` `a=2,b=-1//2` `a=-2,b=1//2` (d) none of these

A

`a = 2 , b = -1`

B

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

C

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

D

None of these

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