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habis dibagi x+2 atau x= - 2 maka
F[- 2]=0
-8 - 4a + 4 - 2b +2a=0 ......1
dibagi x--2 atau x=2 sisa = -4
f[2]= - 4
8 -4a + 4 +2b +2a = - 4 .....2
dari 1 dan 2 didapat a=3 dan b= - 5
fx=x³ +2x²- 5x + 6