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x2=2+√5
pers. kuadrat
(x - x1) (x - x2) = 0
(x - (2 - √5))(x - (2 + √5)) = 0
x² - x(2 - √5) - x(2 + √5) + (4 - 5) = 0
x² - 4x - 1 = 0