Asked by Jill

x squared minus four, at which intervals is the function increasing or decreasing?

Answers

Answered by Anonymous
if f '( x ) > 0 then f is increasing

if f '( x ) < 0then f is decreasing


In this case:

f ( x ) = x ^ 2 - 4


f '( x ) = 2 x


f '( x ) < 0 on interval (-infinity , 0 ]


f '( x ) > 0 on interval [ 0 , infinity ]


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