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cara horner
| 1 + 4 + 1 -6
| 1 5 6
1 |_________________
1 5 6 0
artinya :
x² + 5x + 6 = 0
(x + 3)(x + 2) = 0
maka :
x³ + 4x² + x - 6 = 0
(x - 1).(x + 3).(x + 2) = 0
jadi akar-akarnya adalah :
x1 = 1
x2 = - 3
x3 = - 2