Question

se x2+y2=14 e xy=1 calcule x+y
alguém poderia me ajudar ?

Answer 1

$x^2+y^2=14\\\\(x+y)^2-2xy=14\\\\(x+y)^2-2\cdot1=14\\\\(x+y)^2=16\\\\(x+y)^2=4^2\\\\\boxed{x+y=4}$