Answer
$10i\sqrt 5$
Work Step by Step
$\sqrt -500=\sqrt (100\times5\times-1)=\sqrt 100\times\sqrt 5\times\sqrt -1=10i\sqrt 5$
We know that $\sqrt 100=10$, because $10^{2}=100$.
We know that $\sqrt -1=i$, because $i^{2}=-1$.
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