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Question

f(x)=a In |x|+bx2+x has its extremum values at x = – 1 and x = 2 then a + 2b =


A

0

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B

-3

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C

1

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D

3

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Solution

The correct option is C

1


ax+2bx+1=0atx=1,2a2b+1=0a2+4b+1=0a+2b=1 a+8b=2b12,a=2


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