(3m+2n)²-4(m-n)²

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(3m+2n)²-4(m-n)²
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(3m+2n)²-4(m-n)²
(3m+2n)²-4(m-n)²

(3m+2n)²-4(m-n)²
(3m+2n)²-4(m-n)²
=(3m+2n-2m+2n)(3m+2n+2m-2n)
=5m(m+4n)

(3m+2n+2(m-n))(3m+2n-2(m-n))=(5m)(m+4n)=5m^2+20mn

(3m+2n)²-4(m-n)²
=(3m+2n)²-(2m-2n)²
=(3m+2n+2m-2n)(3m+2n-2m+2n)
=5m(m+4n)