Javascript: You should call functionWithArgs with two numbers after you define it?

JavaScript
1 
function functionWithArgs(a , b) {

  console.log(a + b);

}

functionWithArgs: functionWithArgs(3,16);

functionWithArgs();

// Not sure what I’m doing wrong (question is in the topic)

2

Two things:

This definitely doesn’t look like the example:

functionWithArgs: functionWithArgs(3,16)

And

You should call functionWithArgs with two numbers

This, on the last line, would seem to be being called with no arguments: functionWithArgs()