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p + q = 5
pq = - 1
P.K baru:
x² - (2(p + q) + 2)x + (4pq + 2(p + q) + 1) = 0
x² - (2(5) + 2)x + (4(-1) + 2(5) + 1) = 0
x² - 12x + 7 = 0