I see another solution for this challenge with if and it works, but i think that i can use case.

Where is the problem in my code?

**Your code so far**

```
// Setup
function abTest(a, b) {
// Only change code below this line
switch (abTest){
case a < 0:
return undefined;
break
case b < 0:
return undefined;
break;
}
// 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 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36`

.

**Link to the challenge:**

https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/return-early-pattern-for-functions