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Note You need to understand how to multiply algebraic expressions using the distributive law before starting work on this tutorial. If you feel you need to review this, go back to 3. Multiplying and Factoring Algebraic Expressions.
Q What is a Rational Expression?
A rational expression is an algebraic expression of the form ^{P}/_{Q}, where P and Q are simpler expressions (usually polynomials), and the denominator Q is not zero. Examples

Here are some for you.
We can manipulate rational expressions in the same way that we manipulate fractions. Here are the basic rules.

Now go over the examples and try some of the exercises in Section A.4 of the Algebra Review in Applied Calculus and Finite Mathematics and Applied Calculus. Alternatively, go on to the next tutorial (Solving Equations).