# 2 Parameters and returns the sum

I’m trying to work on this exercise but I’m stuck kind of, what am I doing wrong? Or i didn’t get the question?

When you are calling your function you aren’t passing in any parameters. `x` and `y` are both `undefined`. You can’t add them together because they’re not numbers. `NaN` is “Not a Number”.

while I was trying to put numbers in the paramethers it was giving me a erorr,
“function addNumbers(x(2), y(2))” would this be something to work on?

`x(2)` and `y(2)` aren’t numbers either.

This is where you are defining a function:

``````function addNumbers(x, y) {
return x + y;
}
``````

This is where you are trying to execute that function. What you are trying to execute does not match the definition:

``````addNumbers()
``````

I don’t get it, what am I doing wrong? in this case the output should be xy isn’t it?

When you call the function you have to set the parameters:
`addNumbers(2 + 2);`

it gives me error when I do this;
}

You have defined parameters x and y for your function. These are placeholders for values you will pass into the function which will become the values of x and y. The values passed into a function are know as arguments.

For example, let’s say I have the following function:

``````function subtractNumbers(myValue1, myValue2) {
return myValue1 - myValue2;
}
``````

If I want to return the result of 10 - 6, then I would call the above function with:

``````subtractNumbers(10, 6); // returns 4
``````
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Thank you so much! Now it makes sense!

``````function addNumbers( x + y ) {
return x + y
};
``````

Here you are creating a function in which you have 2 parameters, `return x + y` is returning the sum of these parameters. When you call the function you have to define said parameters, e.g.:
`addNumbers( 2 + 2 );`

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