Respostas

2014-05-14T19:52:57-03:00
1^2 = 1 - 2x1 =2
=-1

espero ter ajudado
2014-05-14T19:53:30-03:00
X²-2x=-1 

x²-2x+1=0 

x'=x"=[2+(4-4)¹/²]/2=1 

Resp. {1}