What is a function?

In primary school when maths was more pictures and colouring and less fear and anxiety, you may have come across something like this:

Now, sadly we don’t get the fun robot anymore, instead we get something that looks like this:

f(x) = x + 10

That is the maths way to write what’s happening in the picture above.

It means that whatever x is, add 10 to it. X is the input.

If we want to input 5 we can write:

f(5) = 5 + 10

f(5) = 15

So basically we replace x with 5 and then work it out.

Here are some practice questions

Composite Functions:

Functions can also be combined.

You can put one function inside another.

(more examples and explanations coming soon)