Given the set of all real numbers, what's the subset of all real numbers that can server as a domain for this function:
$f(x) = \sqrt{x}$
I know that the answer is $x \ge 0$. But is it the same as writing [$0,+\infty$) ? Or same thing as Solution $= \{ x \in \mathbb{R} | x \ge \frac{5}{3} \}$ ?