F(x₀) = x³ - x² - 25·x + C F(1) = x³ - x² - 25·x + C = 0 1 - 1 - 25 + C = 0 C = 25 F(x) = x³ - x² - 25·x + 25 = 0 x³ - x² - 25·x + 25 = 0 x²·(x - 1) - 25·(x - 1) = 0 (x - 1)·(x² - 25) = 0 x = 1 x = 5 x = -5