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x= -2 atau x=3
tanda ubah
x² - x - 6 < 0 ⇒⇒⇒⇒ negatif
(x-3)(x+2) <0
x = 3
x = -2
masukkan ke pert.
-2 3
++ ------------- ++++=
hp = {x|-2<x<3,xeR}