Introduction to Functions

Functions are a transformation, a map, so to speak.
Much like an ordinary map, it tells us how to get somewhere from where we are.

A function does just that. It takes in a value, say, x.
It tells us how to get to y from x.

Functions are denoted by f(x), g(x), etc...
What this means is that we have a function f, or g, or whatever letter, that is operating in terms of x.

Think about this function, for example:f(x), also sometimes seen as y, tells us that this function takes in x, and gives us a value f(x), often times also marked as y, by multiplying x by 3 and adding 5.

Functions can also be combined with each-other.
This is what we'll do next.

Composition of Functions