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II. Setting a Window - Finding One That Works
B. Examples
1. Polynomial Function Examples
For these examples, we will use several of the techniques covered in part A of this module.
i) Example 1: Graph the function
. For this function we will use the ZDECM and ZSTD windows.
Enter the function by pressing
and
.
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Enter the function.
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Press
 to get to ZOOM. |
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Press
for ZSTD. |
Press
for ZDECM. |
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You can see that either one of these windows is good enough to use. However, the ZDECM window is the better one to use since it is a friendly window and the TRACE will move in increments of 0.1.
ii) Example 2: Graph the function
using ZDECM and ZSTD.
Since these windows do not give a good graph, use the TABLE to find the window. Notice in the graphs above that the function crosses the x-axis between -2 and -1 and around 5. Access the TABLE window and enter several values of X between-4 and 8 to determine the appropriate Y values. Once you have a good idea of the values of the function, set the window to fit the graph. You may need to try more than one window to get a good picture, but the TABLE will help you find a good starting point. To get rid of the menu bar across the bottom of a screen press
.
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TABLE
Values
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Set a Window
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Graph
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