C. Rational FunctionsGenerally, 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.