**Tell us what’s happening:**

please guide:

how to return an 'undefined 'as result from the function.

**Your code so far**

```
// Setup
function abTest(a, b) {
// Only change code below this line
if (a == 0 || b == 0){
return ;
}
// Only change code above this line
return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
}
// Change values below to test your code
abTest(2,-2);
```

**Your browser information:**

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36`

.

**Link to the challenge:**