 So let's start off by looking at our first form of syntax. We're going to use the single expression functions And you can see that it takes a very mathematical format f of x and y So that f is the name really of my function and I'm passing to Arguments to it to variables we would say mathematics and it's going to output by using this equal sign x squared minus 3 y So let's execute that and we get f. That's my number and my name of my function And we see it's a generic function with one method Now that method is all about multiple dispatch And we're going to talk about that right at the end to really understand how Julia deals with with functions So we have this name f That's our function name and it takes two arguments. I needn't have called it if I could have used a normal name I could have said Function zero zero one doesn't matter, but I called it f just to show this mathematical format that it takes now Let's pass two arguments to it or two variables as we would say mathematics But there we go. So two and one now f takes two arguments x and y So the first one is going to take the value two the second one's going to take the value one So we passing arguments to our functions inside of these Placeholders that we have at the top and if you think what the answer is going to be well two squared is four Minus three times one is three. So four minus three is this going to equal one Let's see if that is so indeed we get the answer one back Let's do it again this time. We're going to create a new single expression expression function We're going to call it g takes one argument and we're going to use the placeholder x and it's going to return for us x squared and if I call that Three three squared is nine. It's as simple as that. So it's a very shorthand form or syntax of Creating a function. I just give it a name and then in parentheses, I'm just going to list with a comma or the arguments that it takes and I'm going to use the equal sign and Just then an expression for what I want it to do So that single expression functions next up We're going to look at multiple expression functions if we want to do a little bit more