Question

AYUDA!!! POR FAVOR :'C CON RESOLUCIÓN

Answer 1

${x}^{2} + {y}^{2} = 3 \\ (x - y)(x + y) = 3 \\ reemplazando \: (x - y) \\ ( \sqrt{5} - \sqrt{2} )(x + y) = 3 \\ x + y = \frac{3}{ \sqrt{5} - \sqrt{2} } \\ x + y = \frac{3 \times\sqrt{5} - \sqrt{2} }{ \sqrt{5} - \sqrt{2} \times \sqrt{5} - \sqrt{2} } \\ x + y= \frac{3 \times\sqrt{5} - \sqrt{2} }{5 - 2} \\ x + y= \frac{3 \times\sqrt{5} - \sqrt{2} }{3} \\ x + y = \sqrt{5} - \sqrt{2}$