Respostas

2014-04-13T15:39:43-03:00
(2x+y)²=
(2x)²+2.2x.y+y2=
4x²+4xy+y2
Termina aqui.

2014-04-13T15:45:05-03:00
(2x+y) * (2x+y)

4x²+2xy+2xy+2y

4x²+4xy+2y