Respostas

2013-09-16T14:46:57-03:00
(2x+2). (2x-2)=
4x²-4x+4x-4=
4x²-4

1 5 1
2013-09-16T14:51:10-03:00
Se for =0 fica assim
4x²-4x+4x-4=0
4x²-4=0
4x²=4
x²=4/4
x²=1
x= \sqrt{1}
x=1