Staff Selection Commission Quantitative Aptitude — Question 364

Question

If x + y = 10 and xy = 21, find x² + y²

1. 58
2. 62
3. 68
4. 72

Correct answer

A — 58

Explanation (English)

(x+y)² = x² + y² + 2xy. 100 = x² + y² + 42. x² + y² = 58

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