Expressions

Definition

An expression is a combination of numbers, variables, and operators (such as +, -, *, and /) that represents a mathematical relationship. Unlike equations, expressions do not include an equality sign (=).

5 Must Know Facts For Your Next Test

1. Expressions can be simplified but not solved since they lack an equality sign.
2. Terms in an expression are separated by addition or subtraction operators.
3. Like terms in an expression have identical variable parts and can be combined.
4. Expressions can be evaluated by substituting values for the variables.
5. The distributive property is often used to simplify expressions involving parentheses.

Review Questions

• What distinguishes an expression from an equation?
• How do you combine like terms in an algebraic expression?
• What is the process for evaluating an expression with given variable values?

Related terms

Equation:

A mathematical statement that asserts the equality of two expressions.

Term:

A single number, variable, or the product of numbers and variables in an expression.

Coefficient: A numerical factor multiplied by a variable in a term.