jika (x²-x-2) (x²+x-6)<0 maka nilai x yang memenuhi adalah
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(x + 1)(x - 2)(x + 3)(x - 2) < 0
gunakan garis bilangan
++++ +++++ - - - - - ++++
.........o............0...........0.............
-3 -1 2
-1 < x < 2