Q. 79

Mark (√) against the correct answer in the following:

is increasing in

A. (-1, 1)

B. (-1, ∞)


D. none of these

Answer :

For critical points f’(x) = 0

When f’(x) = 0

We get x = 1 or x = -1

When we plot them on number line as f’(x) is multiplied by –ve sign we get

For x>1 function is decreasing

For x<-1 function is decreasing

But between -1 to 1 function is increasing.

Function is increasing in(-1,1).

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