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W(3)=5
W(x)-1
W(3)-1=5-1=4
2.
W(3)=5
2W(x)
2W(3)=2*5=10
3.
W(x)=(x-5)(x^4-12x^3+123x^2-1234x+12345)+5
4.
W(2)=0⇔m*8+4*2^2+(m+2)*2+10=0⇔8m+16+2m+4+10=0⇔10m=-30⇔m=-3