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a = 1
b = 5
c = -2
PK baru yang akar-akarnya dan
x² - (3x1 + 3x2)x + 3x1.3x2 = 0
x² - (3(x1 + x2))x + 9x1.x2 = 0
x² - (3.-5)x + 9.(-2) = 0
x² + 15x - 18 = 0