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αβ = 2/3
persamaan kuadrat baru =
x² - (α + β + 24)x + αβ + 12(α + β) + 144 = 0
x² - (4 + 24)x + 2/3 + 12(4) + 144 = 0
x² - 28 x + 2/3 + 48 + 144 = 0
3x² - 84x + 2 + 144 + 432 = 0
3x² - 84x + 578 = 0