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X² + 3X + 2X + 6 < 0
X(X + 3) +2(X + 3) < 0
(X + 2)(X + 3) < 0
X + 2 < 0 atau X + 3 < 0
X < -2 atau X < -3
HP = {X|X < -2 atau X< -3}
(x+2)(x+3) <0
x+2<0
x<-2
x+3<0
x<-3
HP{x<-2 atau x<-3}
batasnya
HP{-3>x<-2}