Composite functions are functions that are formed by combining two or more functions. The output of one function is used as the input for another function.

For example, let’s say we have two functions: f(x) = 2x and g(x) = x + 3. We can form a composite function by using the output of f(x) as the input for g(x).

The composite function would be written as g(f(x)) = g(2x) = 2x + 3.

In this case, the output of f(x) (2x) is used as the input for g(x), and the resulting composite function is 2x + 3.