In order to see the effects of a **ZOOM** option,
a graph must already be displayed on the screen. To learn how to
enter and graph a function, go to **Graphing
a Function** . For example, the function
**= ** is graphed
below.

The **ZOOM 10:ZoomFit **option allows the user to
select a new **VIEWING RECTANGLE** that has the same **Xmin
**and **Xmax**, but recalculates to show ALL y values.
In the case of the function above, even though there are infinite values of
y in both the positive and negative direction, the calculator tries to show
as many as it can. The resulting new **VIEWING RECTANGLE** is [-10,10,1] X [-949,951,1].

To use the **ZOOMFIT** operation, press the **ZOOM** key, then press 0, and the screens below will appear.

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