A function table displays the relationship between the inputs and outputs of a specified function. A function table will also follow the rules of a function in that every input only produces one output.

## Domain

Inputs are more popularly called the domain of a function. It is used very often in math to restrict the domain to only the real numbers or to only the integers.

## Range or Image

Outputs are more popularly called the range or image of a function. While the domain can be easily restricted, it is much harder to do so with the image because it has more flexibility.

## Example

An example of a function is one where it takes a number and doubles it. For example, one input is 7 while the corresponding output is 14. Many more complex functions exist, even involving imaginary numbers.

About the Author

Zachary Nguyen is an avid guest writer and editor for a year and a half since 2009. His work appears in three publications at his university, including the weekly newspaper "Argus." He is currently in his third year of pursuing a Bachelor of Arts in mathematics and economics. Nguyen attends Wesleyan University.

Photo Credits

scientific calculator image by Stanisa Martinovic from Fotolia.com