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f(2) = 0
2(8) + 4a + 14 + 6 = 0
36 + 4a = 0
a = - 9
f(x) = 2x³ - 9x² + 7x + 6
(x - 2)(x - 3)(2x + 1) = 0
faktor yang lainnya: (x - 3) dan (2x + 1)