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Bab Persamaan Kuadrat
Matematika SMP Kelas VIII

x² + x - 2 = 0
(x + 2) (x - 1) = 0
x = -2 atau x = 1

((x1 + x2) - 2 . x1 . x2)/(x1 . x2)
= ((-2 + 1) - 2 . (-2) . 1)/(-2 . 1)
= (-1 + 4)/-2
= 3/-2

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