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Question

If x*2+1/x*2=27,then value of x+1/x is

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Solution

We know !

(x + 1/x)² = x² + 1/x² + 2

(x + 1/x)² = 27 + 2

(x + 1/x)² = 29

taking square roots on both sides

x + 1/x = √29

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