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  1. Solution : 

    In the question we get, 
    x2 + 1/x2
    = 102

    Now,
    = x2 + 1/x2 = 102
    or, (x – 1/x)2 + 2.x = 1/x = 102
    or, (x – 1/x)2 = 100
    or (x – 1/x)
    = √10

    Therefor, The value of x2 + 1/x2 will be √10

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