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 2:Zoom In option allows the user to select a new VIEWING RECTANGLE around a given point that is smaller than the existing VIEWING RECTANGLE. Both the Zoom In and Zoom Out results depend on the ZOOM FACTORS.
To select the ZOOM 2:Zoom In option, first press the ZOOM key and then select 2.
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Note: The X and Y coordinates may vary depending on what was last done on the calculator. Regardless of what X and Y are displayed on the screen, they will remain in the center of the image.
Now press the ENTER key. The VIEWING RECTANGLE will remain centered around the X and Y listed at the bottom of the screen, but the size of the VIEWING RECTANGLE will be 1/4 of its orginal size (assuming Xfact and Yfact are both 4). Thus, the standard VIEWING RECTANGLE of [-10, 10, 1] X [-10,10,1] is now [-2.5,2.5,1] X [-2.5,2.5,1]. See the graph below.
Pressing the ENTER key again gives a graph similar to the one shown below. The new VIEWING RECTANGLE is [-0.625,0.626,1] X [-0.625,0.626,1] .
The Zoom In option also may be centered on a point. As previously shown, first graph the function in the standard viewing rectangle (6:ZStandard ), press ZOOM, and then 2 to return to the following image:
Using the ARROW keys, place the cursor on the desired Zoom In center. Below, the center was chosen as approximately (1.287,-3.049). An arrow, which is not part of the calculator display indicates the location of this point.
To zoom in leaving that point at the center, press ENTER repeatedly.
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