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pemfaktoran =
(x+2) (x+1)
x+2=0 x+1=0
x=-2 x=-1
x1=-2 x2=-1
3α = 3.x1
= 3.(-2) = -6
3β = 3.x2
= 3.(-1) = -3
persamaan kuadrat
x²-(α+β)x+αβ=0
x²-((-6+(-3))x+(-6)(-3)=0
x²-(-9)x+18=0
x²+9x+18=0