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W(-3)=-3^3+8*3^2-3*17+6=-27-51+72+6=-78+78=0
W(-3)=0
W(x) jest podzielny przez dwumian (x+3)
(x^3+8x^2+17x+6):(x+3)=x^2+5x+2
-x^3-3x^2
-------------------
5x^2+17x
-5x^2-15x
----------------------
2x+6
-2x-6
===============
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