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= -(1/3)x³ + 3x² - 8x
f(4) - f(2) = -(1/3)(4)³ + 3(4)² - 8(4) - (-(1/3)(2)³ + 3(2)² - 8(2))
= -64/3 + 48 - 32 -(-(8/3) + 12 - 16)
= -(56/3) + 20
= 4/3