Zoom In, Zoom Out, and ZBox Commands on the TI-83 Plus
The Zoom In and Zoom Out commands on the TI-83 Plus graphing calculator enable you to zoom in or zoom out from an already graphed function. The ZBox command allows you to define a new viewing window for a portion of your graph by enclosing it in a box.
Zoom In and Zoom Out: After the graph is drawn, these commands allow you to zoom in on a portion of the graph or to zoom out from the graph. They work very much like a zoom lens on a camera.
Press [ZOOM] to zoom in or press [ZOOM] to zoom out. Then use the
keys to move the cursor to the spot on the screen from which you want to zoom in or zoom out. Then press [ENTER]. The graph is redrawn centered at the cursor location.
You can press [ENTER] again to zoom in closer or to zoom out one more time. Press [CLEAR] when you’re finished zooming in or zooming out. You may have to adjust the window settings.
ZBox: This command allows you to define a new viewing window for a portion of your graph by enclosing it in a box. The box becomes the new viewing window.
To construct the box, press [ZOOM] and use the
keys to move the cursor to the spot where you want one corner of the box to be located. Press [ENTER] to anchor that corner of the box. Then use the
keys to construct the rest of the box. When you press these keys, the calculator draws the sides of the box. Press [ENTER] when you’re finished drawing the box. The graph is then redrawn in the window defined by your box.
When you use ZBox, if you don’t like the size of the box you get, you can use any of the
keys to resize the box. If you don’t like the location of the corner you anchored, press [CLEAR] and start over.
When you use ZBox, [ENTER] is pressed only two times. The first time you press it’s to anchor a corner of the zoom box. The next time you press [ENTER] is when you’re finished drawing the box, and are ready to have the calculator redraw the graph.