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p + q = 2
pq = 5
Persamaan kuadrat baru:
x² - ( p + q + 4)x + (pq + 2(p + q) + 4) = 0
x² - (2 + 4)x + (5 + 2(2) + 4) = 0
x² - 6x + 13 = 0