Resposta :
x ² = 2 x - 1 Verificação:
x ² - 2 x + 1 = 0 ( + 1 ) ² = 2. 1 - 1
Δ = ( - 2 ) ² - 4 .1 . 1 1 = 2 - 1
Δ = 4 - 4 1 = 1 ( V )
Δ = 0
x₁ = 2 ₊ 0 / 2 x ₂ = 2 - 0 /2
x₁ = 1
x₂ = 1
x ² - 2 x + 1 = 0 ( + 1 ) ² = 2. 1 - 1
Δ = ( - 2 ) ² - 4 .1 . 1 1 = 2 - 1
Δ = 4 - 4 1 = 1 ( V )
Δ = 0
x₁ = 2 ₊ 0 / 2 x ₂ = 2 - 0 /2
x₁ = 1
x₂ = 1