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x=2 jest pierwiastkiem wielomianu
(-x³+x²/2+4x-2):(x-2)=-x²-1,5x+1
x³-2x²
= -1,5x²+4x
1,5x²-3x
= x-2
-x+2
= =
Δ=9/4+4=25/4⇒√Δ=5/2
W(x)=(x-2)(x+2)(x-(1/2))
W(x)=0⇔x=-2 ∨ x=1/2 ∨ x=2