### Rational Equations and Expressions

 Rational expressions (and equations) involve ratios of polynomials. The root word of rational is "ratio" for that reason.For example: Rational expressions can be simplified by canceling out of common factors in the numerator and denominator. For that reason, factoring is an essential skill needed.Excluded values are values that a variable CANNOT be because it would cause an expression to be dividing by zero.For example, the following rational expression would have excluded values of x = -3 and -1 since that would make the denominator zero.Solving rational equations is using general understanding of solving equations.Rational equations can be used to model numerous real world applications.Key Termsrational expressionsrational equationsEssential QuestionsHow can rational equations be created and solved?Practice ProblemsApplication Practice Problems Simplifying Rational ExpressionsSolving Rational EquationsSolving Rational Equations (example problem 1 of 2)Solving Rational Equations (example problem 2 of 2)Inverse VariationInverse Variation (example problem)Applications of Rational EquationsNumber Theory (example problem)