Answer
$d\approx2.828
\text{ units}
$
Work Step by Step
Using $d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$ or the Distance Formula, the distance, $d$, between the given points, $\left(
\sqrt{5},-\sqrt{3}
\right) \text{ and } \left(
0,0
\right),$ is
\begin{array}{l}\require{cancel}
d=\sqrt{ \left(\sqrt{5}-0 \right)^2+\left(-\sqrt{3}-0 \right)^2}
\\\\
d=\sqrt{ \left( \sqrt{5} \right)^2+\left( -\sqrt{3} \right)^2}
\\\\
d=\sqrt{ 5+3}
\\\\
d=\sqrt{ 8}
\\\\
d\approx2.828
\text{ units}
.\end{array}