We will have the following:
*It will have a domain of x equal or greater than 0:
It will have a domain of y equal or greater than 0:
***
We have the following:
We determine the domain as follows:
Since the function is subject to a root, no negative value can be put in it, so its domain (Since x is not accompanied by any value in the root) can only "hold" values equal or greater than 0.
We determine the range as follows:
Since the function is subject to a root, it's solutions will never be negative, so its range can only hold values equal or greater than 0.