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α β = c/a
misal p = -α dan q = -β
p+q = -(α + β)= b/a
p q= (-α)(-β) = c/a
pers yang baru x² - (p+q)x + pq = 0
x² - b/a x + c/a = 0 kalikan a
ax² - bx + c = 0
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