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x₂ = 4
(x - x₁) (x - x₂) = 0
(x - (-6)) (x - 4) = 0
(x + 6) (x - 4) = 0
x² - 4x + 6x - 24 = 0
x² + 2x - 24 = 0
Jadi persamaan kuadratnya adalah x² + 2x - 24 = 0.