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a = 1, b = a-1, c = 2
α = 2β
α + β = -b/a = - (a-1)/1 = 1-a
α . β = c/a = 2/1 = 2
α . β = 2
2β. β = 2
2 β² = 2
β² = 1
β = √1 = -1 atau 1
nilai β yang memenuhi yaitu -1
α+β = 1-a
2β+β = 1-a
3.β = 1 - a
3.(-1) = 1-a
a = 1+3 = 4