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W(2)=-8+4a₂+10+a₀=0
W(-3)=27+9a₂-15+a₀=0
4a₂+a₀=-2
9a₂+a₀=-12
---------------- _
-5a₂=10
a₂=-2
-2*4+a₀=-2
a₀=-2+8=6
Odp. W(x)=-x³-2x²+5x+6.