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= 2(p+q) + 2
= 2 (5) + 2
= 12
α x β = (2p+1)(2q+1)
= 4pq + 2p + 2q + 1
= 4pq + 2(p+q) + 1
= -4 + 2(5) + 1
= -4 + 10 + 1
= 7
persamaan kuadrat baru = x² - 12x + 7 = 0