Question

xy = 120 , x^2 + y^2 = 289 , എങ്കിൽ x + y =

• A. 24
• B. 33
• C. 21
• D. 23

Answer 1

Answer:

D. 23

(x + y)² = x² + y² + 2xy (x + y)² = 289 + 2 × 120 =289 + 240 =529 (x + y) = √529 =23