Functions

[Math Tutor]

What is a function?

[leesajohnson]

A function is a relation between the set of inputs and the set of permissible outputs with the property that each input is related to exactly one output. An example is a function that relates each real number x to its square x2.

[faithhill]

In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x2