Question 191602
4m^4n+6m^3n-16m^2n^2-24mn^2 
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common factor: 2mn
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2mn(2m^3 + 3m^2 - 8mn -12n)
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2mn[m^2(2m + 3) - 4n(2m + 3)]
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2mn(2m+3)(m^2-4n)
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Cheers,
Stan H.