Question

simplify (2m+5n)(3m+4n)-(7m+3n)(2m+n)


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Answer 1

Step-by-step explanation:

(2m+5n)(3m+4n)-(7m+3n)(2m+n)

[2m(3m+4n)+5n(3m+4n)]-[7m(2m+n)+3n(2m+n)]

(6m²+8mn+15mn+20n²)-(14m²+7mn+5mn+3n²)

6m²+8mn+15mn+20n²-14m²-7mn-5mn-3n²

-8m²+23mn+17n²-12mn

-8m²-11mn+17n²