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Hemant Sharma

· started a discussion

· 1 Months ago

wrong option (Question:922316.0)

hello sir ..... es question ka answer "14" hoga

(x-1/x)^3 = 2^3
x^3 - (1/x)^3 -3(x - 1/x) = 8
x^3 - (1/x)^3 -3(2) = 8
x^3 - (1/x)^3 = 8 + 6 = 14 answer

Question:

     If x = 1 -  2   , the value of  x-1x3   is:

Options:
A)

     8 

B)

  22   

C)

     1 

D)

     ±8

Solution:

 x = 1 –  2   

→1x   =  11-2   =  1+ 2-1   = – 2   -1

→   x –  1x   = 1 – 2   +  2   +1 = 2

→x-1x3   = 8

Knowledge Expert

· commented

· 1 Months ago

Dear student,
Given answer is correct.
Keep learning,
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