Respostas

  • Usuário do Brainly
2014-07-21T11:39:19-03:00
(x + 2)²
x² + 2 . x . 2 + 2²
x² + 4x + 4
x² + 4x + 4 = 0
Δ = b² - 4 . a . c
Δ = 4² - 4 . 1 . 4
Δ = 16 - 16
Δ = 0

x = (- b ± √Δ)/(2 . a)
x = (- 4 ± √0)/(2 . 1)
x = (- 4 ± 0)/2

x' = (- 4 + 0)/2
x' = - 4/2
x' = - 2

x'' = (- 4 - 0)/2
x'' = - 4/2
x'' = - 2

S = {- 2}