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    If , what is the value of ?
    Question

    If , what is the value of ?

    A.

    10404

    B.

    10402

    C.

    10406

    D.

    10400

    Correct option is B

    Given:  
    x1x=10x-\frac{1}{x} =10 
    To find: x4+1x4x^4+\frac{1}{x^4}    
    Formula Used: 
    (ab)2=a2+b22ab(a-b)^2 = a^2 +b^2 -2ab ​​
    Solution: 

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