Interval of a function is called decreasing, when y goes down (decreases) as x increases (moving to the right).Similarly an interval of a function is called increasing, when y goes up (increases) as x increases (moving to the right).

Not we always express these intervals in terms of x vlaues.

Based on above definition of increasing and decreasing intervals for a function. Consider f(x)=x2, identify the interval given below as increasing or decreasing interval:

(-infinity, 0) :is this an increasing or decreasing interval?

(0, +infinity):is this an increasing or decreasing interval?