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6x² - 6x - 12 > 0
6(x² - x - 2) > 0
6(x + 1)(x - 2) > 0
x < -1 atau x > 2
syarat naik f ' (x) > 0
f ' x =6x^2-6x-12 > 0
6 (x+1)(x-2) > 0
naik pada interval = x < -1 atau x > 2