#Mark the correct alternative in each of the following
The minimum value of 
is
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
f’’(5)=7>0
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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