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W(4)=64+16-56-24=0
W(x) jest podzielny przez (x-4)
x²(x-4) + 5x(x-4) +6(x-4) = 0
(x-4)(x² + 5x +6) = 0
(x-4)(x²+2x+3x+6) = 0
(x-4)*[x(x+2)+3(x+2)]=0
(x-4)(x+2)(x+3)=0
x-4=0 v x+2=0 v x+3=0
Odp. x∈{-3, -2, 4}