Question


Answer

Distribute terms in parentheses, and then regroup terms in the form of the difference of squares


(m^2-1)(n^2-1)+4mn

=m^2n^2-m^2-n^2+1+4mn

=m^2n^2+2mn+1-(m^2-2mn+n^2)

=(mn+1)^2-(m-n)^2


=(mn-m+n+1)(mn+m-n+1)

Steven Zheng posted 10 months ago

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