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    Question


    A.

    -256

    B.

    -512

    C.

    256

    D.

    512

    Correct option is B

    Given:
    x8+8x=1\frac{x}{8} + \frac{8}{x} = 1   
    Concept Used:  
    if       x+1x=1       then,x3=1\text{if} \ \ \ \ \ \ \ x + \frac{1}{x} = 1 \ \ \ \ \ \ \ then,\\ x^3 = -1​​
    Solution:  

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