Respuestas

2012-09-24T02:34:58+02:00

(3m-4n)²=(3m)²-2(3m)(4n)+(4n)²=9m²-24mn+16n²

2012-09-24T02:48:35+02:00

(3m-4n)(3m-4n)=9m-12mn-12mn+16n^2

=9m-24mn+16