# What is function composition?

##### 2 Answers

See the explanation.

#### Explanation:

Informal speaking: "it's a function of function".

When you use one function as a argument of the other function, we speak of the composition of functions.

Example:

Let

If we substitute:

You can, however, find

Refer to explanation

#### Explanation:

Combining two functions by substituting one function's formula in place of each

The composition of functions

The domain and range for the functions are