x+1/x=5. What is the value of x^2 + 1/x^2?

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• A 23
• B 25
• C 27
• D 10

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Answer: A. 23

x+1/x=5. (x+1/x)^2=25 Hence, x^2+2+1/x^2=25. x^2+1/x^2=23 .

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