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## Chapter 9Rational Functions and Relations

9.1 Simplify, Multiply, and Divide Rational Expressions

9.2 Add and Subtract Rational Expressions

9.3 Simplify Complex Rational Expressions

9.4 Rational Equations

9.5 Graph Rational Functions

9.6 Variation Functions

### 9.1 Simplify, Multiply, and Divide Rational Expressions

Recall that a rational number is a number that can be written as a ratio of two integers, or a fraction where the numerator and denominator are integers. A rational expression is the ratio of two polynomials, or a fraction where the numerator and denominator are polynomials. Recall that a polynomial is a general term that can refer to a monomial or an expression with many terms.

Examples of Rational Expressions

The last example, –3

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