**Evaluate a Function/ Value**

We illustrate by evaluating Y1 = x^2 - x - 6 at x = 1.7.

A
function may be evaluated from the graph screen. Press **MENU
3** to access the GRPH-TBL screen. Enter the function into the equation editor,
then press **F5** to select DRAW. Adjust the graph view from either the zoom
menu or by adjusting the View Window settings. The graph of the function in the
standard window is shown at right.

From the graph screen, press **F1** to select TRACE. Simply type in the
input value; here,

1 . 7 EXE

The calculator then marks the point on the graph and displays the coordinates
at the bottom of the screen. Press **ESC** to return to the graph menu.

**Warning** The typed value of *x* must
be between the Xmin and Xmax values entered in the View Window; otherwise, an
ERROR message appears. In that case, either adjust the window or evaluate the
function from the table screen.

If you have multiple graphs appearing on the same screen, you can transfer from one graph to another using the thumb pad arrow keys. Accordingly, you may evaluate any function appearing in the graph window.

To obtain a functional value for an *x*-value not appearing in the window,
press **F5** to select TABL. Then press **F1** to select EDIT. Enter your
*x*-value of interest. The resulting values are then placed as the first
items in the table.