if Fx=x³-x²+x+1 then the value of f1+f-1÷2
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F1 = 1-1+1+1 = 2
F-1 = -1-1-1+1 = -2
Therefore, f1+f-1%2 = 0
F-1 = -1-1-1+1 = -2
Therefore, f1+f-1%2 = 0
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