f(x) = x³ - 12x
f'(x) = 3(x³-¹) - 12
f'(x) = 3x² - 12
f'(x) > 0
3x² - 12 > 0
3x² > 12
x² > 12/3
x² > 4
x² - 4 > 0
(x + 2)(x - 2) > 0
x < - 2 atau x > 2
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f(x) = x³ - 12x
f'(x) = 3(x³-¹) - 12
f'(x) = 3x² - 12
f'(x) > 0
3x² - 12 > 0
3x² > 12
x² > 12/3
x² > 4
x² - 4 > 0
(x + 2)(x - 2) > 0
x < - 2 atau x > 2