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Q.

Maximum value of xx+ax+b occurs when x = 

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a

AM of a, b

b

GM of a, b

c

HM of a, b

d

sum of a, b

answer is B.

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Detailed Solution

fx=xx+ax+bfIx=x+ax+b1-xx+a+x+bx+a2x+b2  =x2+xa+b+ab-2x2-a+bxx+a2x+b2 =ab-x2x+a2x+b2

min or max of fx

fIx=0 ab=x2 x=ab

=G.M of a,b

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