Respostas

2014-02-23T11:59:38-03:00
x²-2x+1=0 ~> a = 1 , b = -2 , c = 1

Δ = b² - 4ac
Δ = (-2)² - 4.1.1
Δ = 4 - 4
Δ = 0          ~> as raízes serão iguais

x = -b 
± √Δ
         2a

x = -(-2) ± √0
          2.1

x = ± 0 = 2 = 1
        2       2
2 5 2