# What Is an Algebraic Expression and Why Is It Important?

What is an algebraic expression? An algebraic expression is a mathematical phrase that uses coefficients, unknown variables, algebraic operations, and constants. However, an expression cannot have an equals sign.

Let's expand on the definition of an algebraic expression and explain how it’s different from other types of mathematical expressions.

**What Is an Algebraic Expression?**

Let's explore the terms that make up an algebraic expression using the following example:

**. **The numerical value of 3 represents a coefficient, which is a number used in unison with a
variable.

**. **In this expression, x is a variable, which is a letter that represents an unknown quantity.

**. **The addition sign in this expression is an algebraic operation. Used interchangeably with the
phrase “arithmetic operations,” algebraic operations can also be represented by
multiplication, division, or subtraction symbols. They can also include a square root or
exponent in combination with one of these symbols.

**. **The quantity of 14 represents a constant, which is a number that has a clearly defined value.

All of these terms must be present in order to classify as an algebraic expression.

**Expressions and Equations**

There are many different types of mathematical expressions and phrases. Let's explore how algebraic equations and numerical expressions relate to algebraic expressions.

**Algebraic Equations**

The one thing that separates an algebraic expression from an algebraic equation? The latter has an equal sign. Here are some examples of expressions vs. equations:

Algebraic Expressions:

Algebraic Equations:

**Numerical Expressions**

A numerical expression is a mathematical phrase that only uses algebraic operations and constants. Here are some examples of numeric expressions:

Since numerical expressions don't use variables, they do not classify as algebraic expressions.

**Types of Algebraic Expressions**

Now that we know what types of mathematical phrases do not classify as algebraic expressions, let's explore the different types of algebraic expressions: binomial expressions, trinomial expressions, and polynomial expressions.

Binomial expressions have two terms (one constant and one variable) and one algebraic operation.

Trinomial expressions have two algebraic operations and three different terms: one constant and two different variables, one constant and two variables with two different exponents, or three variables with three different exponential values.

Polynomial expressions have four or more terms tied together by multiple algebraic operations:

**What Is an Algebraic Expression and Why Does It Matter?**

When you understand how to identify a coefficient, variable, algebraic operation, and constant, you can start classifying and working with different types of algebraic expressions. You’ll use algebraic expressions throughout many levels of math.

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