Question

how to solve this question ​

Answer 1

Answer:

use identities to solve this question

Answer 2

x+y= 8

x^2+y^2 = (x + y) ^2 = x^2+2xy+y^2

we can write x^2+y^2+2xy

(x+y) ^2 + 2xy

(8)^2+2×1

64+2

66