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x = 3
27 - 18 + 3n + 6= 0
3n + 15 = 0
n = - 5
x³ - 2x² - 5x + 6 = 0
horner
.....|1....-2...-5....6
3...|.......3....3...-6
----------------------
......1....1....-2
x² + x - 2= 0
(x+2)(x-1) = 0
x = - 2 atau x = 1
akar lainnya -2 dan 1