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α + β = -b/a = -(-4)/2 = 2
αβ = c/a = 1/2
Bantuan:
α² + β² = (α + β)² - 2αβ = 2² - 2 x ½ = 4-1 = 3
Maka:
α' = α/β dan β' = β/α
Sehingga: