Staff Selection Commission Quantitative Aptitude — Question 267

Question

If x + 1/x = 5, find x² + 1/x²

1. 23
2. 25
3. 27
4. 29

Correct answer

A — 23

Explanation (English)

(x + 1/x)² = x² + 1/x² + 2 = 25. So x² + 1/x² = 23

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