I. Entering Functions to Graph on the TI-89

E. Radical Functions

When you enter a radical function, you must put parentheses around the expression. You can use radical notation, or you can convert the expression to one with a rational exponent. There are two radical keys that you can use. These are demonstrated below.

1. Square Root Functions

Enter the function by using the square root key and then enter it by using a rational exponent. The square root key is accessed by entering and then (times). This is shown as the function y1 below. To enter the function as a rational function, use the exponent 1/2. Remember to put the parentheses in. The rational version is shown in y2 below.

2. Other Radical Functions

To enter a radical function other than a square root, convert the function to an exponential function.


I. Entering
II. Windows
& Styles
III. Working
with Graphs
IV. Special
V. Other
Graph Modes