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misal:
p(x) = x³ - 12x + k
p(2) = 0
8 - 24 + k = 0
k = 16
x³ - 12x + 16 = (x - 2)(x² + 2x - 8)
= (x - 2)(x + 4)(x - 2)
= (x - 2)²(x + 4)
bilangan tersebu habis dibagi juga oleh (x + 4)