Answer
$5\sqrt{2}$
Work Step by Step
Extracting the factor that is a perfect power of the index results to\begin{array}{l}\require{cancel}
\sqrt{50}
\\\\=
\sqrt{25\cdot2}
\\\\=
\sqrt{(5)^2\cdot2}
\\\\=
5\sqrt{2}
.\end{array}
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