What is a function?

Input, Relationship, Output

We will see many ways to think about functions, but there are always three main parts:The input, The relationship,The output

First, it is useful to give a function a name.The most common name is "f", but we can have other names like "g" ... or even "marmalade" if .

But let's use "f": what goes into the function is put inside parentheses () after the name of the function

So f(x) shows us the function is called "f", and "x" goes in and we usually see what a function does with the input f(x)=2x , it shows us that function "f" takes "x" and duplicate it

Example: with f(x) = 2x: an input of 4 becomes an output of 8.In fact we can

write f(4) = 8, a function relates an input to an output.

Saying "f(4) = 8" is like saying 4 is somehow related to 8

Thank's !!!

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