Q. 20

#Mark the correct alternative in each of the following

The minimum value of is

A. 75

B. 50

C. 25

D. 55

Answer :

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

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

for minima at x=c, f’(c)=0 and f’’(c)>0

f’(x)=0 x3=125 or x=5


Hence, x=5 is a point of minima for f(x) and f(5)=75 is the minimum value of (x).

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