Have you heard of the Rule of Three? This rule says that functions should be described three ways: symbolically, graphically and numerically. As you investigate functions from each of these three perspectives and see how the three representations are connected, you will gain a deeper understanding of the important mathematical concept of function. The TI-89 provides a platform to investigate functions in these three different ways.

Lesson Index:

1.1 - Basic Features

1.2 - Describing Functions Symbolically

1.3 - Describing Functions Graphically

1.4 - Describing Functions Numerically

After completing this module, you should be able to do the following:

• Reset the TI-89 to its factory default settings
• Adjust the calculator contrast
• Define and use a function on the TI-89
• Enter and edit commands on the Home Screen
• Display a function graphically
• Use the table feature of the TI-89 to describe a function numerically
• Find roots symbolically, graphically and numerically