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akarnya = 4 --> f(4)= 0
p(256) -13(64) +6p(16) + 208 - 80 = 0
256 p +96 p -704 = 0
352 p = 704
p= 2
2x⁴ - 13 x³ + 12 x² + 52x - 80 - 0
dengan horner
(x -4)(x+2)(x-2)(2x-5) = 0
x = 4, x = - 2, x = 2 , x = 5/2