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### Course: Algebra (all content) > Unit 7

Lesson 1: Evaluating functions- What is a function?
- Worked example: Evaluating functions from equation
- Evaluate functions
- Worked example: Evaluating functions from graph
- Evaluate functions from their graph
- Worked example: evaluating expressions with function notation
- Evaluate function expressions

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# What is a function?

Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions. Created by Sal Khan.

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