Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Inverse functions are two functions that "undo" each other. When you apply one function and then the inverse function, you get back to where you started.
Related terms
Composition of Functions: This term refers to combining two or more functions into a single function by applying one after another.
Domain and Range: These terms refer to the set of all possible input values (domain) and output values (range) for a given function.
Horizontal Line Test: This test is used to determine if a function has an inverse by checking if any horizontal line intersects the graph at more than one point.