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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 $= \{ x \in \mathbb{R} | x \ge \frac{5}{3} \}$ ?

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    5/3? Where did that 5/3 come from?2011-10-15

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