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1 Answer

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

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

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

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

(2m-3n)(2m+6n)=2(2m-3n)(m+3n)=

2(2m2+3mn-3n2)=4m2+6mn-6n2.

by Top Rated User (1.2m points)

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