An input is the value you put into a function or a rule. In an input-output table, the input goes in the first column, and the rule is applied to it to produce the output. Each input has exactly one output.
Math Dictionary / Input
Input
An input is the value put into a function or rule.
FunctionsGrade 6Grade 7Grade 8Algebra 1SATACT
What it means
For many functions, the input is the x-value.
Also called: x-value
Examples
| If f(x) = x + 2, input 5 gives output 7 |
| The input goes into a function machine |
| An ordered pair writes input first |
Common mistake
A function can have only one output for each input.
Try one
Question: For f(x) = 2x, what is the output when the input is 4?
Show answer
8.