ZOOM 1:Zbox

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.  

Screen Picture of TI-83 Calculator

The ZOOM 1:Zbox option allows the user to define a box on the screen that will become the new VIEWING RECTANGLE.

To select the ZOOM 1:Zbox option, first press the ZOOM key and then select 1. 

Screen Picture of TI-83 Calculator

The cursor is flashing at (0,0) which cannot be seen in the picture above.  Now use the ARROW keys to move the cursor to a spot that will become a corner of the new VIEWING RECTANGLE.  Below the cursor has been moved with the UP ARROW, up the Y-axis to about (0, 3.2), then left with the LEFT ARROW, to about (-1.3, 3.2).  Next, press ENTER to locate the upper left corner of the new VIEWING RECTANGLE.    When ENTER is pressed, the cursor changes.

Screen Picture of TI-83 Calculator Screen Picture of TI-83 Calculator
Screen Picture of TI-83 Calculator

Now use the ARROW keys to form a box that will be the new VIEWING RECTANGLE.   Below, the RIGHT ARROW key was used to extend the box to the right to about X = 1.06. Then the DOWN ARROW key was used to lower the box to about Y = .24.  Finally, press the ENTER key to see the new VIEWING RECTANGLE with is the boxed in region expanded to the full screen.

Screen Picture of TI-83 Calculator Screen Picture of TI-83 Calculator
Screen Picture of TI-83 Calculator



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