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Q.

If ⨍ (x)=alogx+bx2+x has its extreme values at x=-1 and x=2 then

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a

a=2, b=-1

b

a=2, b=-1/2

c

a=-2, b=1/2

d

a=1, b=1

answer is B.

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Detailed Solution

fx=alogx+bx2+x fIx=a/x+2bx+1

fx is minimum or maximum

fIx=0 a/x+2bx+1=0 2bx2+x+a=0

given extream values at x= -1,2

fIx=0 roots are -1,2

-1,+2=-1/2b               -1*2=a/2b 2b=-1                                -2*2-1/2=a b=-1/2                                 a=2

a=2,b=-1/2

 

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