Math Dictionary / Domain and Range
Domain and Range
The domain is the set of possible inputs of a relation or function; the range is the set of possible outputs.
FunctionsGrade 8Algebra 1Algebra 2SATACT
What it means
Domain asks what x-values can go in. Range asks what y-values can come out.
Also called: inputs and outputs
Examples
| For points (1, 4), (2, 5), domain = {1, 2} |
| Range = {4, 5} |
| For y = x^2, the range is y >= 0 |
Common mistake
Do not swap them: domain goes with inputs, range goes with outputs.
Try one
Question: For points (2, 7), (3, 7), (5, 9), what is the domain?
Show answer
The domain is {2, 3, 5}.