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  1. Solution : 

    In the question we get, 
    x2 + 1/x2 = 79

    Now,
    = x2 + 1/x2 = 79
    =(x + 1/x)2 – 2.x. 1/x = 79
    or, (x + 1/x)2 – 2 = 79
    or, (x + 1/x) = 81
    ∴ (x + 1/x)
    = √81
    = 9

    Therefor, The value of x2 + 1/x2 will be 9

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