Please submit your concern

Explanation:

Given, x - y = 25

Squaring both sides, we get

x2 + y2 - 2xy = 625

⇒ x2 + y2 - 156 = 625 [since xy = 78]

⇒ x2 + y2 = 625 + 156 = 781

Hence, option (b).

Subscribe to our Newsletter

© 2022 | All Rights Reserved | Apti4All