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Contoh :
1. Susunlah persamaan kuadrat yang akar-akarnya x1 = 3 dan x2 = 5!
Jawab :
(x - x1) (x - x2) = 0
(x - 3) (x - 5) = 0
x^2 - 3x - 5x + 15 = 0
x^2 - 8x + 15 = 0