I. Entering Functions to Graph on the TI-89

C. Rational Functions

Generally, when you enter a rational function, it is safer to enter the function using parentheses around both the numerator and the denominator. If the numerator has only one term, parentheses are not necessary (shown in the first two examples).

Example: Enter the functions shown. You should note that even though you enter parentheses, when you press ENTER, the display will not show them. However, you need to enter parentheses around any numerator or denominator that has a product, sum, or difference in it.

Parentheses are not needed
in the numerator.
Put parentheses in the
denominator.
Put parentheses around
both the numerator and
the denominator.
Put parentheses around
both the numerator and
the denominator.

 

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