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Syarat turun
y ' < 0
3x² - 12x + 9 < 0
x² - 4x + 3 < 0
(x - 1)(x - 3) < 0
nilai nol
x = 1 atau x = 3
garis bilangan
+ + + | - - - | + + +
1 3
Jadi interval turun : 1 < x < 3