# expressionsexplain "monomial expression", "binomial expression","trinomial expression", "polynomial expression"

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A monomial expression is one that has only one term. It can be something like 10x or 8. It is not added to anything or multiplied by anything -- nothing else is done to it.

A polynomial expression is one that has more than one term (so of course binomial epxressions have 2 terms and trinomials have 3). It can be something like

a^2 + b^2

Because there you have multiple monomials being added to make a polynomial.

The number of terms of an expression gives the name of the expression.

The expression that has a single terms is called *monomial expression.*

For instance, y is an expression. Also 6z is an expression, too.

A *binomial expression* has 2 unlike terms, added or subtracted:

7y + 8z

A *trinomial expression* has 3 unlike terms, added or subtracted:

15xz + 17 - 9t

A *polynomial expression* has more unlike terms, added or subtracted:

x^3 + 4yz - 15u + 18w - 21