Question

Спростити вираз: (3m+4n)2 - (m-2n)(3m-8n)

Answer 1

$(3m+4n)^2 - (m-2n)(3m-8n) = 9m^2+24mn+16n^2-(3m^2-8mn-6mn+16n^2)=9m^2+24mn+16n^2-3m^2+14mn-16n^2=6m^2+38mn$