What is the domain and range of #y^2 = x#?
Both the domain and range are
The domain is all the possible values for x, and range is all the possible values for y.
The square root function can only take in positive numbers, and it can only give out positive numbers. So all possible x values must be greater than 0, because if x was for example -1, the function would not be a real number. The same goes for y values.