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αβ= -2
MISAL
X1= α/β DAN X2=β/α
X1+X2 = α/β + β/α = α²+β²/αβ=(α+β)²-2αβ/αβ=(-2)² - 2.-2/-2 = 8/-2 = -4
X1.X2 = α/β . β/α =αβ/αβ = -2/-2 = 1
PK BARU
X²- (X1+X2)X + X1.X2 = 0
X²- (-4)X + 1 =0
X²+4X+1=0
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