Q.

Find maximum or minimum values of the functions y=25x2+5-10x

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a

2

b

4

c

6

d

8

answer is B.

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Detailed Solution

For maximum and minimum value, we can put dydx=0dydx=50x-10=0x=15Further,d2ydx2=50or d2ydx2 has positive value at x=15, Therefore, y has minimum value at x=15.Substituting  x=15 in given equation, we getymin=25152+5-1015=4
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Find maximum or minimum values of the functions y=25x2+5-10x