**I. Entering the Function in the
Graph Window**

E. Radical FunctionsWhen you enter a radical function, you must put the entire expression within parentheses. 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 FunctionsEnter 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 . 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 FunctionsThere is built in function that you can use to enter a function such as . This function is found by pressing 5. However, before you enter this function, you must enter the root. In this example, the root is 5. You can also enter the function by using a rational exponent as shown in y2 below.