Q. 79

Mark (√) against A. (-1, 1)

B. (-1, ∞)

C.

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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