Answer
$\color{blue}{5k^2|m|}$
Work Step by Step
RECALL:
If $n$ is an even integer, $\sqrt[n]{a^n} = |a|$
Using the rule above gives:
$\sqrt{25k^4m^2}
\\=\sqrt{5^2k^4m^2}
\\= {|5k^2m|}
\\=\color{blue}{5k^2|m|}$
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