(m-3n)(2m+n)
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(m-3n)(2m+n)(m-3n)(2m+n)(m-3n)(2m+n)=2m²+mn-6mn-3n²=2m²-5mn-3n²2m^2-5mn-3n^2
(m-3n)(2m+n)
(m-3n)(2m+n)
(m-3n)(2m+n)
=2m²+mn-6mn-3n²
=2m²-5mn-3n²
2m^2-5mn-3n^2
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