Overview of Working With Functions on TI-89

To define a function on the calculator, go to F4 > Define, and type in "f(x)=FUNCTION," where FUNCTION represents an equation containing the variable of the function. The screen should now say something like "Define f(x)=x^2," at which point you can press enter. From here you can enter in something such as f(5), and the calculator will display the value of x^2 where x=5. This is extremely handy to use for the homework over the weekend.