If x-1 / x = 3, then value of x3 - 1/x3 is ?

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Aditya Patel asked 18-Sep-2019 in Math by Aditya Patel

If x-1 / x = 3, then value of x3 - 1/x3 is:

a) 32

b) 36

c) 40

d) 49

1 Answer

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Sanat Shukla answered 19-Sep-2019 by Sanat Shukla

Answer -- The right option is  (b)                                                                                

Explain - 

If x-1 / x = 3, then value of x3 - 1/x3  is ?