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  • Roma
  • Community Manager
2010-02-02T21:26:28+01:00
X³ + x² - 9x - 9 = 0
x²(x + 1) - 9(x + 1) = 0
(x² - 9)(x + 1) = 0
(x - 3)(x + 3)(x + 1) = 0
x - 3 = 0 v (x + 3) v x + 1 = 0
x = 3 v x = - 3 v x = - 1
czyli
x₁ = 3
x₂ = - 3
x₃ = - 1