Question

If x² + y² = 0.. then x + y = ? Where x an y are real numbers.​

Answer 1

${x}^{2} + {y}^{2} = 0 \\ add \: 2xy \: to \: both \: side \\ {x}^{2} + {y}^{2} + 2xy = 0 + 2xy \\ {(x + y)}^{2} = 2xy \\ x + y = \frac{ + }{} \sqrt{2xy}$