\[\boxed{\mathbf{965\ (965).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ y = x² - 4x + 3\]
\[x_{0} = \frac{4}{2} = 2\]
\[y_{0} = 4 - 8 + 3 = - 1\]
\[2)\ y = x² - 8\]
\[x_{0} = 0\]
\[y_{0} = 0 - 8 =\]
\[= - 8 \Longrightarrow принадлежит\ \]
\[оси\ ординат.\]
\[3)\ y = x² - 6x + 9\]
\[x_{0} = \frac{6}{2} = 3\]
\[y_{0} = 9 - 18 + 9 =\]
\[= 0 \Longrightarrow принадлежит\]
\[\ оси\ абцисс.\]
\[4)\ y = x² + 2x\]
\[x_{0} = - \frac{2}{2} = - 1\]
\[y_{0} = 1 - 2 = - 1.\]