Question

if X+y=2 and x²+y²=2, what is the value of xy?​

Answer 1

x + y = 2

On squaring both sides , we get

x^2 + y^2 + 2xy = 4

=> 2 + 2xy = 4 [x^2 + y^2 = 2]

=> 2xy = 2

=> xy = 1