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f(x) = 2x^3 -15x^2 +12x -9
a. f(-4) = 416 --> f(-4) ≠ 0 --> bukan faktor
b. f(-2) = -109--> f(-2) ≠ 0 --> bukan faktor
c. f(-1) = -29 --> f(-2) ≠ 0 --> bukan faktor
d. f(1) = -1 ---> f(1) ≠ 0 --> bukan faktor
e. f(2) = -29 ---> f(2) ≠ 0 --> bukan faktor