What is x+1/x if x^2+1/x^2=14
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x^2 + 1/x^2 = 14, x+1/x= ?
(x+1/x)^2 = x^2 + 2 + 1/x^2.
But, x^2+1/x^2 = 14 and hence, (x + 1/x)^2 = 14 + 2 = 16.
Thus, x + 1/x = sqrt (16) = +/- 4.
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