Khan Academy: Function Introduction: What Is a Function

After defining a simple function from a word problem, a short video shows how to find its domain and range. The instruction reinforces the definitions of domain and range with a concrete example.

The short example shown in this video starts with a given set of numbers in the domain and the range that represents a function. One needs to map the points on a coordinate plane.

Extending his asymptotes lesson from the previous video, Sal shows viewers another example of graphing rational functions. This video is shorter than the previous one and could be shown in a single class session.

Graphing functions by hand is pretty easy. A comprehensive video reviews how to graph different function types. It looks at the constant, identity, quadratic, cubic, absolute value, square root, cube root, reciprocal, and squared...

Video gives an introduction to what differential equations are and shows how they are different from regular equations. Shows an example of a differential equation and how to check if a given answer is a correct solution to a...

Recognizing functions is explained in this short video.

Use a graph to recognize a function.

Jesse Roe and Sal talk about the difference between equations and functions

Explore how to recognize functions.

Explore recognizing functions in this video.