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p.q = c/a => -1/1 = -1
akar akar baru :
(2p + 1) + (2q + 1) = 2(p + q) + 2
= 2(5) + 2
= 12
(2p + 1) x (2q + 1) = 4pq + 2(p + q) + 1
= 4(-1) + 2(5) + 1
= 7
persamaan kuadrat baru :
x² - (p + q)x + pq = 0
= x² - (12)x + 7 = 0
= x² - 12x + 7 = 0