Category: Mathematics | Last updated: 2026-09-18

If x + y = 10 and xy = 21, what is x² + y²?

A) 58

B) 52

C) 48

D) 42

Explanation

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

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