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If y = a logx + bx^(2) + x has its extre...

If y `= a logx + bx^(2) + x` has its extremum value at `x = -1 and x = 2,` then

A

`a = 2, b = -1`

B

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

C

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

D

none of these

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The correct Answer is:
B
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