(m+4n)(m-n)-6(m+2n)(m-3n),

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(m+4n)(m-n)-6(m+2n)(m-3n),(m+4n)(m-n)-6(m+2n)(m-3n),(m+4n)(m-n)-6(m+2n)(m-3n),=(m²+3mn-4n²

(m+4n)(m-n)-6(m+2n)(m-3n),
(m+4n)(m-n)-6(m+2n)(m-3n),

(m+4n)(m-n)-6(m+2n)(m-3n),
=(m²+3mn-4n²)-6(m²-mn-6n²)
=m²+3mn-4n²-6m²+6mn+36n²
= -5m²-9mn+32n²