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If y=a log x +bx^(2)+x has its exteme va...

If `y=a log x +bx^(2)+x` has its exteme values at x=-1 and x=2, then find a and b.

A

`2, -1/2`

B

2, -4

C

3, -1/2

D

`-3,2`

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The correct Answer is:
A
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