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

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

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

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