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An expression is a combination of terms and operations and can take on many different formats. In Chapters 11 through 16, you see many types of expressions and several types of equations that are created from the expressions. Many of these expressions and equations have very precise and descriptive names.

 A polynomial is an expression containing variables and constants. It consists of one or more terms. The terms are separated by addition and subtraction. And the exponents on the variable terms are always whole numbers, never fractions or negative numbers.Ex:

 A monomial is a polynomial consisting of exactly 1 term.Ex:

 A binomial is a polynomial consisting of exactly 2 terms.Ex:

 A trinomial is a polynomial consisting of exactly 3 terms.Ex:

 A linear expression is a polynomial in which there is no variable with an exponent greater than 1. In fact, the exponents can be only 1 or 0. And there must be at least one variable term with an exponent of 1.Ex:

 A quadratic expression is a polynomial in which there is no variable with an exponent greater than 2. In fact, the exponents can be only 2, 1, or 0. And there must be at least one variable term with an exponent of 2.Ex.