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α+β=-b/a = -1/1 = -1
αβ = c/a = -6
PKB yg akar2nya 3α dan 3β :
3α+3β = 3(α+β) = 3(-1) = -3
3α.3β = 9αβ = 9(-6) = -54
PKB : x^2+3x-54