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f ' (x) > 0
3x² - 6x > 0
3x (x - 2) > 0
x < 0 atau x > 2
Syarat Turun
f ' (x) < 0
3x² - 6x < 0
3x (x - 2) < 0
0 < x < 2
x^2-2x
x(x-2)
x=0 x=2