**Maximum/Minimum**

It
is best to find extreme values for a function on a given interval by going through
the graph screen. We illustrate with *y* = *x*(*x* - 1)(*x*
+ 2). Press **MENU 3** to access the equation
editor. Then enter the function as Y1. Press **F5** to select DRAW. Press
**SHIFT V-Window** to adjust the window for a better view.

To find an extreme value, maximum or minimum, for a function on a given interval,
press **F4** to access the G-SLV menu. Select 2:Max or 3:Min. We illustrate
by finding the left turn around point. Press **2** to select 2:Max. The screen
then marks the leftmost maximum point and indicates the coordinates.

Obtaining
a minimum value is done in a similar way. The only difference is that from the
Math menu, one selects 3:Min rather than 2:Max. Press **ESC** to return to
the graph menu, press **F4** to access the G-SLV menu, then press **3**
to select 3:Min. In this example, the right turn around point is indicated in
the screen at the right.