Answer
-4$m^{5}\sqrt 5m$
Work Step by Step
This can be simplified as follows:
= $-m*\sqrt 80m^{9}$
= $-m*\sqrt 16m^{8}*\sqrt 5m$
= $-m*4m^{4}*\sqrt 5m$
= $-4m^{5}\sqrt 5m$
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