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Verified answer
Materi : Persamaan Kuadratx² - 4x - 1 = 0
x² - 4x = 1
(x - 2)² - 4 = 1
(x - 2)² = 5
x - 2 = (+-)√5
x = 2 (+-)√5
x₁ = 2 + √5
x₂ = 2 - √5