TI-84 Plus CE Graphing Calculator For Dummies, 3rd Edition
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In calculus, you need to graph the derivative of a function in order to find its critical points, which you can do on your TI-84 Plus calculator. Just follow these steps:

  1. Enter your functions in the Y= editor.

  2. Use the arrow keys to place your cursor in an open equation in the Y= editor.

  3. Press [MATH][8] to access the nDeriv template.

  4. Press


    then press [ALPHA][TRACE] and choose your function, then press the right arrow and


    See the first screen. This is a sneaky move. You aren't using the nDeriv( template to take the derivative at a specific x-value. Instead, by taking the derivative at x = x, you are taking the derivative at all points where the function is defined.

  5. Press [GRAPH] to display the graph of your function and the derivative of the function.

    See the second screen.

  6. Press [2nd][TRACE] to access the Calculate menu.

  7. Press [2] to select the zero option.

  8. If necessary, repeatedly press the up- and down-arrow keys until the derivative function appears in the border at the top of the screen.

    Don’t forget to do this step!

  9. Enter the Lower and Upper Bounds, then a guess and press e.

    This is illustrated in the third screen.

About This Article

This article is from the book:

About the book author:

Jeff McCalla is a mathematics teacher at St. Mary's Episcopal School in Memphis, TN. He cofounded the TI-Nspire SuperUser group, and received the Presidential Award for Excellence in Science & Mathematics Teaching.

C.C. Edwards is an educator who has presented numerous workshops on using TI calculators.

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