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Question

If (x+1x)=5, then (x2+1x2)=?
(a) 25
(b) 27
(c) 23
(d) 25125


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    Solution

    x+1x=5
    Squaring both sides,
    (x+1x)2=(5)2x2+1x2+2=25x2+1x2=252=23


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