Q. 4

#Mark the correct alternative in each of the following

For the function

A. x = 1 is a point of maximum

B. x = –1 is a point of minimum

C maximum value > minimum value

D. maximum value < minimum value

Answer :

In such type of questions

find both the maximum and minimum value to compare the options.

so first,


put f’(x)=0;


Hence by second derivative test

f’’(x)>0 or f”(x)<0

so it’s a point of minimum or maximum respecctively.



so x=1 is a point of minimum

and x=-1 is a point of maximum

f(1)=2 is minimum value.

f(-1)=-2 is maximum value.


maximum value<minimum value.

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