Using CAS on a Graphing Calculator

Some graphing calculator models include an integrated computer algebra system (CAS) for performing symbolic calculations. A symbolic approach to problem solving can be much more informative than a numerical approach. The following steps apply specifically to HP graphing calculator models with CAS, but the same general approach applies almost universally.

Instructions
1. Hit the "CAS" button in the home view of the graphing calculator to enter the CAS environment. The menus for CAS appear on the bottom of the screen and offer a range of functions and adjustable parameters.

2. Configure the CAS settings. Depending on the type of problem you're solving, you may need to set the parameters carefully. Alternatively, if you want just the basic default settings, configure the settings to default using the "ALGB" menu and the "CFG" option.

3. Enter the equation or expression that you want to manipulate or solve. If you're working with a single variable, you can just use the "X, T, Theta" button to quickly enter the variable. Otherwise, use the "ALPHA" button to enter a different variable. You can use the arrow buttons for highlighting expressions.

4. Highlight the expression or equation when you're ready to perform a manipulation or to get a solution. Use the menus at the bottom of the screen to choose the operation, whether it be factoring, differentiation, integration, solution or another type of operation. You can also simply hit "ENTER" to perform an evaluation.

5. Reformat the solution if necessary. The result may not be in the format you want, so you may need to expand it, for example. Simply go back to Step 4 to do this.


Tips & Warnings
- The owner's manual is the best reference for the details concerning all the different possible uses of a graphing calculator CAS. Different manufacturers may have different syntaxes or procedures for using the CAS on their graphing calculator models.
- Experimentation is the best way to learn how to use the CAS feature on a graphing calculator. The more time you spend with it, the more familiar you'll become.