# Algebraic expressions

Contents

Wait, why are we using letters in math? How can an 'x' represent a number? What number is it? This tutorial is great if you're just beginning to delve into the world of variables and expressions.

Learn how to substitute (or "plug in") values for variables and evaluate algebraic expressions.

Learn the basics of writing expressions with variables.

Learn how to combine like terms (with negative numbers and variables), including more complex problems involving the distributive property.

Learn how to apply the distributive property to numerical expressions (without variables) and algebraic expressions (with variables). The distributive property is also sometimes called the distributive law.

Learn to tell whether or not two algebraic expressions are equivalent by combining like terms and using the distributive property.

Learn how to simplify rational expressions that contain further rational expressions within their numerators or denominators.