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β = 2√5 + 3
α + β = √5 -3 + 2√5 +3 = 3√5
αβ = (√5 - 3)(2√5 +3) = 10 - 6√5 + 3√5 - 9 = 1 - 3√5
Rumus : x² - (α+β)x +αβ = 0
x² - 3√5.x + 1 - 3√5 = 0