In these lessons, we will learn how to find the domain and range of functions.

**Related Pages**

Function Notation

Composite Functions

Lessons for Algebra 1

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The following diagrams show the domain and range of a function. Scroll down the page for more examples and solutions.

**Domain and Range**

How to find the domain and range?

An important part of understanding functions is understanding their domain and range. Domain and range are all the possible x-values and y-values of the function, and can often be described easily by looking at a graph. In order to grasp domain and range, students must understand how to determine if a relation is a function and interpreting graphs.

This video provides two examples of how to determine the domain and range of a function given as a graph.

**Examples of how to determine the domain and range of a function given as a graph**

**How to Find the Domain & Range of a Function**

Finding the domain and range of a function is as simple as finding the possible X and Y values, respectively.

Learn about X and Y values as dependent and independent variables.

**Finding the Domain of a Function Algebraically**

Finding the domain of a function, without graphing.

Restrictions:

- No zero in the denominator of a fraction.
- No negative numbers under square roots after simplifying.

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