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f(x) =¹/₃ x³ + x² - x + c
f(1) = 0 --> ¹/₃ (1³) + (1)² - (1) + c = 0
¹/₃ +c = 0
c = - ¹/₃
f(x) = ¹/₃ x³ + x² - x - ¹/₃