Algebra

Variable

A letter that stands for an unknown number.

Coefficient

The number multiplied by a variable.

Expression

Numbers, variables, and operations with no equals sign.

Equation

A math sentence that says two things are equal.

Inequality

A math sentence using

Like terms

Terms with the same variable and exponent. They can be combined.

Distributive property

Multiply the outside number by every term inside the parentheses.

System of equations

Two or more equations with the same unknowns, solved together.

Quadratic

An equation or expression with x². Its graph is a U-shape (parabola).

Factor

To rewrite as a product of simpler parts.

Polynomial

An expression with one or more terms made of variables with whole-number exponents.

Exponential growth

Growing by the same percent (or factor) each step.