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

Asked 18-Sep-2019
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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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Answer -- The right option is  (b)                                                                                

Explain - 

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