Help with domain question with g(f(x))

[mesa]

Homework Statement

If f(x)=√x and g(x)=√(x^2+1) what is the domain of g(f(x))?

The Attempt at a Solution

I cam up with (-∞,+∞) since the square root of a square is always positive, am I missing something here?

 

[mesa]

Nevermind, just saw it lol