Answer
5$m^{6}$(m+1)(m-1)
Work Step by Step
5$m^{8}$-5$m^{6}$=5$m^{6}$($m^{2}$-1)=
5$m^{6}$($m^{2}$-$1^{2}$)=5$m^{6}$(m+1)(m-1)
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