TI-84 Plus Graphing Calculator For Dummies, 2nd Edition by Jeff McCalla & C.C. Edwards

Author:Jeff McCalla & C.C. Edwards
Language: eng
Format: epub
Publisher: John Wiley and Sons, Inc.
Published: 2013-05-19T16:00:00+00:00

Figure 11-11: Solving equations by graphing.

3. Press % and graph your functions in a viewing window that contains the intersection points of the two functions.

See the second screen in Figure 11-11. I like having a really nice window for this, but you don’t have to. You may need to zoom out by pressing #3 and pressing e to make sure you have all the intersection points in the graphing window.

4. Press `$5eee to find one of the intersection point(s) of the two graphed functions.

See the third screen in Figure 11-11. If there is more than one intersection point, you must press `$5ee and use the >< keys to navigate near the other intersection point. Press e to make your guess.

You find your solution in the border at the bottom of the screen beneath the word “Intersection.”

Drawing the Inverse of a Function

The big idea of inverse function is that x and y switch places. Your calculator has a built-in feature that enables you to “draw” the inverse of a function. Essentially, the calculator is “graphing” (not drawing) the inverse of the function. However, unlike a graph, you can’t perform a trace or any other type of function evaluation on the drawn inverse. Another reason this term is used may be that the drawn inverse need not be a function.

Follow these steps to draw the inverse of a function:

1. Enter your functions in the Y= editor.

See the first screen in Figure 11-12. I entered Y1 = ex. This function has a mathematically famous inverse, f–1(x) = ln(x).

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