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W(-1)=-1+a-b+2=0
W(2)=8+4a+2b+2=0
a-b=-1
4a+2b=-10 /:2
a-b=-1
2a+b=-5
------------- +
3a=-6
a=-2
-2-b=-1
-b=-1+2
b=-1
Odp. a=-2, b=-1