W(-3)=(-3)³+a·(-3)²+b·(-3)-9=(-27)+9a-3b-9
W(1)=1³+a·1²+b·1-9=1+a+b-9
9a-3b=9+27
a+b=8
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W(-3)=(-3)³+a·(-3)²+b·(-3)-9=(-27)+9a-3b-9
W(1)=1³+a·1²+b·1-9=1+a+b-9
9a-3b=9+27
a+b=8