Q. 18

is maximum when x =

A.

B.

C.

D. 0

Answer :

Differentiating f(x) with respect to x, we get

Differentiating f’(x) with respect to x, we get

For maxima at x=c, f’(c)=0 and f’’(c)<0

f’(x)=0⇒ or

and >0

Hence, is a point of maxima for f(x).

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