[tex]W(x) = x^{3}-ax^{2}+x+b\\\\W(1) = 3 \ \ i \ \ W(-2) = -3[/tex]
[tex]W(1) = 1^{3}-a\cdot1^{2}+1+b = 3\\W(-2) = (-2)^{3}-a\cdot(-2)^{2}+(-2)+b = -3\\\\1-a+1+b = 3\\-8-4a-2+b = -3 \\\\-a+b = 1 \ \ /\cdot(-4)\\-4a+b = 7\\\\4a-4b=-4\\-4a+b = 7\\------- \ \ +\\-3b = 3 \ \ /:(-3)\\b = -1\\\\a = b-1 = -1-1 = -2\\\\Odp. \ b = -1, \ a =-2[/tex]
