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Q.

If fx=alogx+bx2+x has extreme values at x = -1 and x = 2, then the ordered pair (a, b) =

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a

2, -1

b

2, -12

c

-1, 2

d

-12, 2

answer is B.

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Detailed Solution

fx=a log x+bx2+x f1x=ax+2bx+1 fx is min or max f1x=0 ax+2bx+1=0 2bx2+x+a=0

roots are -1, 2 -1+2=-12b b=-12 -1×2=a2b a=-4b=2

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