(2m-n)^2-(3m+2n)^2

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(2m-n)^2-(3m+2n)^2(2m-n)^2-(3m+2n)^2(2m-n)^2-(3m+2n)^2(2m-n)^2-(3m+2n)^2=【(2m-n)-(3m+2n)】【(2m-n)+(3m

(2m-n)^2-(3m+2n)^2
(2m-n)^2-(3m+2n)^2

(2m-n)^2-(3m+2n)^2
(2m-n)^2-(3m+2n)^2
=【(2m-n)-(3m+2n)】【(2m-n)+(3m+2n)】
=(-m-3n)(5m+n)
= -(m+3n)(5m+n)

(2m-n)²-(3m+2n)²
=[(2m-n)+(3m+2n)][(2m-n)-(3m+2n)]
=(5m+n)(-m-3n)
=-(5m+n)(m+3n)

-5m^2-16mn-4n^2