Respostas

2014-05-23T10:49:06-03:00
X^2-2x=-1
x^2-2x+1=0

a= 1 b=-2 c=1

delta = b^2-4.a.c
delta= (-2)^2-4(1)(1)
delta= 4-4=0

x=-b= 
+-√delta/2a
x=2+-
√0/2
x=1