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f'(x) = 3x² + 6x
* Fungsi naik
Fungsi naik apabila f'(x) > 0
f'(x) > 0
3x² + 6x > 0
x² + 2x > 0
x(x + 2) > 0
x > -2
Jadi, fungsi itu naik ketika x > -2
sedangkan fungsi itu turun ketika x < -2