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Input

One-page printable reference

See It in Action

Two examples of the idea done right—and one common look-alike that is not right.

EXAMPLE

EXAMPLE

NON-EXAMPLE

Definition

The term "input" refers to the value you put into a function or relation. It’s the variable or number that you provide to see how it affects the output.


For example, if you have a function f(x) = 2x + 3, the input is the value of x that you substitute into the function. If you input x = 4, then the output would be f(4) = 2(4) + 3 = 11. So, in essence, the input is the starting value that you use to calculate the result.

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This term is one piece. Our courses build it into everything around it—short videos, practice, and the “why” behind every concept.

Algebra 1

Lines, slope, functions & more

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Shapes, proofs & spatial reasoning

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