\[\boxed{\text{517\ (517).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ x² + y² + 2x + 1 = 0\]
\[(x + 1)^{2} + y^{2} = 0\]
\[\Longrightarrow x = - 1,\ \ y = 0.\]
\[\textbf{б)}\ x² - 2x + y^{2} + 4y + 5 = 0\]
\[(x - 1)^{2} + (y + 2)^{2} = 0\]
\[\Longrightarrow x = 1,\ \ y = - 2.\]
\[\boxed{\text{517.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ под\ графиком\ функции\ \]
\[y = x;\]
\[\textbf{б)}\ над\ графиком\ функции\ \]
\[y = x.\]