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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 = frac{-1}{2]`,`b = frac{1}{4}

B

`a = -2`, `b = frac{1]{4}`

C

`a = 2`, `b = frac{-1}{2}

D

`a = -2`, `b = frac{-1}{2}`

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