Question

please solve
I am not able to.....
I need your help​

Answer 1

Step-by-step explanation:

x+y = 2(2+√5)^(1/2)

=> (x+y)^2 = 4(2+√5) = 8+4√5

xy = (2+√5) - (2-√5) = 2+√5 - 2+√5 = 2√5

=> 2xy = 2×2√5 = 4√5

x^2 + y^2

= (x+y)^2 -2xy

= 8+4√5 - 4√5

= 8