A function is a relationship between two — or more — variables. If you input a number into a function, it can only output one value.

The output variable of a function, often named y

The input variable of a function, often named x

L is the limit of the function f at the point a if: the output goes towards L as the input gets closer to a.

Mathagon

Limits of Functions Pointwise

Solve exercises about finding the limits of some well-known functions.