If x²+1/x²=23 evaluvate x+1/x – InterviewSolution

1.

If x²+1/x²=23 evaluvate x+1/x

Answer»

(x+1/x)^2=x^2+1/x^2+2

(x+1/x)^2=23+2

(x+1/x)^2=25

x+1/x=+5 or x+1/x=-5

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