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Verified answer
Jawabf(x)= x³ + 3x² - 9x - 12
inteval turun f' (x )< 0
3x² + 6x - 9 < 0
x² + 2x - 3 < 0
(x +3)(x - 1) < 0
x > - 3 atau x < 1
- 3 < x < 1