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How to Simplify Rational Expressions Using the TI-89

Simplifying a rational expression on the TI-89 is straightforward, as long as you include the correct symbols and punctuation. When entering the expression into the calculator, you must use separate parentheses around the numerator and the denominator -- for example, type in the rational expression as follows: (9x-3)/(x-7).

Instructions

- 1
  Turn on the calculator and enter the numerator of the rational expression -- be sure to enclose the numerator in parentheses. Failing to include the numerator in parentheses will result in an incorrect answer for the calculation.
- 2
  Press the divide key and enter the denominator of the rational expression -- again using parentheses.
- 3
  Press the enter key to have the calculator simplify the rational expression. You can check the answer by substituting it into the original expression.

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