#### Answer

$10+i\sqrt{3}$

#### Work Step by Step

Using the properties of radicals and that $i=\sqrt{-1}$, then the given expression, $
10+\sqrt{-3}
,$ is equivalent to
\begin{array}{l}\require{cancel}
10+\sqrt{-1}\cdot\sqrt{3}
\\\\=
10+i\cdot\sqrt{3}
\\\\=
10+i\sqrt{3}
.\end{array}