Find the interval(s) over which the function is increasing and/or decreasing.
First, find the derivative of the function as follows:
Suppose is a differentiable function over the interval . If for all , then is an increasing function of over the interval . Likewise, if for all , then is a decreasing function of over the interval . Now use this fact to find the
values of for which the function is increasing.
Next, find the values of for which the function is decreasing.
Thus, the function is increasing over the interval , and it is decreasing over the interval .