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f'(x) = 3x² + 6x
jika
selalu naik→ f'(x) > 0
selalu turun → < 0
maks/min → =0
3x² +6x = 0
3x ( x + 2) = 0
x = 0 atau x = -2
maka nilai maks
-8 + 12 + 8 = 12
itu nilai maks , maaf kalo salah