Question

If x-1/x=3, find the value of x cube - 1/x cube

Answer 1

(x-1/x)^3= x^3- 1/x^3 -3(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
36=x^3- 1/x^3

Answer 2

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