Math Help - Equations Problem

1. Equations Problem

$xy=8$
$x^2+y^2=10$
$(x+y)^2= ?$

$xy=8$
$x^2+y^2=10$
$(x+y)^2= ?$
Expand: $(x + y)^2 = x^2 + 2xy + y^2 = 2xy + x^2 + y^2$.
Now substitute $xy=8 \,$ and $\, x^2+y^2=10$ .....