Variables and Algebraic Expression

Definition of variable

A quantity of unknown value that is used to represent a number

Definition of arithmetic expression

A numerical expression with a fixed value

Definition of algebraic expression

An expression that consists of two or more terms that are combined by addition or subtraction

Definition of a term

Each quantity in an expression

Definition of an algebraic term in an algebraic expression

A product of a variable with a number

Definition of coefficient of a variable in a term

All the other factors in the term

Definition of like terms

Terms that have the same variable with the same power

Definition of unlike terms

Terms that do not have the same variable or the same power