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(-1/3)x³ + 3x² - 8x
masukan batasnya:
[(-1/3)(64) + 3(16) - 8(4)] - [(-1/3)(8) + 3(4) - 8(2)]
= -64/3 + 16 + 8/3 + 4
= -56/3 + 20
= -56/3 + 60/3
= 4/3