\[\boxed{\mathbf{616\ (616).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ x = 0 \Longrightarrow \ линейное\ \]
\[уравнение.\]
\[2)\ x² = 0\ \ \]
\[a = 1,\ \ b = 0,\ \ c = 0.\]
\[3)\ x² + x = 0,\ \ \]
\[a = 1,\ \ b = 1,\ \ c = 0.\]
\[4)\ x² + 1 = 0,\ \ \]
\[a = 1,\ \ b = 0,\ \ c = 1.\]
\[5)\ x² - 4x + 2 = 0,\ \ \]
\[a = 1,\ \ b = - 4,\ \ c = 2.\]
\[6)\ 3x³ - x^{2} + 6 = 0 \Longrightarrow\]
\[\Longrightarrow не\ квадратное\ уравнение.\]
\[7) - 2x^{2} + 7x - 8 = 0,\ \ \]
\[a = - 2,\ \ b = 7,\ \ c = - 8.\]
\[8)\ x³ - x - 9 = 0 \Longrightarrow не\ \]
\[квадратное\ уравнение.\]
\[9)\ 6 - x^{2} + 4x = 0,\ \ \]
\[a = - 1,\ \ b = 4,\ \ c = 6.\]
\[10) - x^{2} - 2x + 3 = 0,\ \ \]
\[a = - 1,\ \ b = - 2,\ \ c = 3.\]