Question 415849
Use the difference of squares formula to get



{{{m^4 - 16n^4=(m^2-4n^2)(m^2+4n^2)=(m-2n)(m+2n)(m^2+4n^2)}}}



So {{{m^4 - 16n^4=(m-2n)(m+2n)(m^2+4n^2)}}}



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