Question

If x+1/x=3 find x^3+1/x3

Answer 1

(x+1/x)^3=x^3+1/x^3+3×x×1/x (x+1/x)
3^3=x^3+1/x^3+3×3
27=x^3+1/x^3+9
27-9=x^3+1/x^3
18=x^3+1/x^3

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