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Function Notation

Instead of drawing boxes all the time, we need a way to talk about functions with math symbols.

Let's take a look at a couple of the boxes in our last lesson:

THE RULE:  Add 1

domain guys go in -> rule: + 1 -> range guys spit out
 

If we use x to represent our domain guys, here's the official notation:

f( x ) = x + 1 ... f( x) is the input ... x + 1 is the output

(You read this guy, f(x), as "f of x.")

x guys go in... and x + 1 guys spit out.

But, x + 1 = f( x ) ...