Mathematics
OpenStudy (anonymous):

domain of square root of 5x-20

OpenStudy (yttrium):

The domain of this equation can be expressed as $\sqrt{5x-20} \ge0$ Therefore, @sbarthole ?

OpenStudy (anonymous):

It's a tautology to say $\sqrt{f(x)}\geq 0$When $$f(x)\in\mathbb R$$.

OpenStudy (anonymous):

It's a positive square root. What you wanna check is that $5x-20\geq 0$

OpenStudy (yttrium):

Thanks for emphasizing @wio.