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a b = -2
misal p= a²b dan q = ab²
p+q = ab (a+b) = -2(-4) = 8
pq = (ab)³ = (-2)³ = -8
Persamaan kuadrat yg akar akarnya p dan q
x² - (p+q) x + (pq) = 0
x² -8 x - 8 = 0