I’m trying to write a JavaScript function to calculate the sum of two numbers [closed]

A red line came up after I typed the function parameters showing that there is an error in what I typed

function myFunction(x1 + x2){
  document.getElementById('func').innerHTML= 'hello world'
}
myFunction(2, 3);

<p id="func"></p>

this is my code snipet. I was expecting to get the sum of 2 and 3, which is 5. but the code is not working