3x² + 4x - 4 = 0
Δ = b² - 4 . a . c
Δ = (- 4)² - 4 . 3 . - 4
Δ = 16 + 48
Δ = 64
[tex]x = \frac{-b +/- \sqrt{DELTA } }{2 . a}[/tex]
x = - 4 ± √64
2 . 3
x = - 4 ± 8
6
x' = - 4 - 8
6
x' = - 12
6
x' = - 2
[tex]x'' = \frac{- 4 + 8}{6}[/tex]
[tex]x'' = \frac{4}{6}[/tex]
x'' = 0, 66
S = { - 2, 0, 66 }
