Question

Sabe se que x2+y2=20=e xy=3qual o valor de (x+y 2

Answer 1

$\Large\boxed{\begin{array}{l}\sf (x+y)^2=x^2+y^2+2xy\\\sf (x+y)^2=20+2\cdot3\\\sf (x+y)^2=20+6\\\sf (x+y)^2=26\end{array}}$