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jadi jika dikalikan ax³ +bx² +-4a x -4b <--->3x³-5x²-12x+20
diperoleh a=3 dan b=-5
sehingga hasilbaginya = 3 x - 5
atau pakai cara horner x²-4 = (x-2)(x+2) jadi habis bdagi x=-2 dan x=2
3 -5 -12 20
-2 -6 22 -20 +
3 -11 10 0
+2 6 -10
3 -5 0
hasil pembagian = 3x - 5