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α + β = -2
αβ = -1/3
x² - (x1 + x2)x + x1.x2 = 0
x² - (1 - 2α + 1 - 2β)x + (1-2α) (1-2β) = 0
x² - (2 - 2 (α+β)) x + (1 -2β -2α + 4αβ) = 0
x² - 6x + (5 -4/3) = 0
x² - 6x +11/3 = 0
------------------------- x 3
3x² -18x + 11 = 0