extrema occur where is undefined (we don't have to worry about that here, our functions are defined everywhere on the intervals given) and where

with absolute extrema however, in addition to finding the value of the function at the points where the derivative is zero, we must also check the end-points. that is, for the first you must find and and for the second you must also find and .

the largest value you obtain is the absolute maximum, the smallest value you obtain is the absolute minimum.

can you continue?