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6x² + 2x - 4 < 0
(6x - 4)(x + 1) < 0
+++++++ - - - - - - - - ++++++++++
------------o--------------o------------------
-1 2/3
Dikatakan naik jika x < -1 atau x > 2/3
Dikatakan turun jika - 1 < x < 2/3