Algebra: Variables and Expressions

A variable is a symbol, often a letter, that represents a number that can change or vary.

An expression is a combination of numbers, variables, and operations (like addition and multiplication) that represents a value.

7

46

b^2 represents 3^2, which equals 9.

13

14

22

The order of operations is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right), often abbreviated as PEMDAS.

An equation states that two expressions are equal, while an expression does not include an equality sign.