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If x =-1 and x=2 ar extreme points of f(...

If x =-1 and x=2 ar extreme points of f(x) =`alpha log|x|+betax^(2)+x` , then

A

`alpha=-6,beta=(1)/(2)`

B

`alpha=-6,beta=-(1)/(2)`

C

`alpha=2,beta=-(1)/(2)`

D

`alpha=2,beta=(1)/(2)`

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The correct Answer is:
C
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