Respostas

  • Usuário do Brainly
2014-05-20T15:32:31-03:00
(2x + 2) . (x - 3) = 0
2x² - 6x + 2x - 6 = 0
2x² - 4x - 6 = 0
Δ = b² - 4 . a . c
Δ = (- 4)² - 4 . 2 . (- 6)
Δ = 16 + 48
Δ = 64

x = (- b 
± √Δ)/2 . a
x = (- (- 4) ± √64)/2 . 2
x = (4 ± 8)/4

x' = (4 + 8)/2
x' = 12/2
x' = 6

x'' = (4 - 8)/2
x'' = - 6/2
x'' = - 3