\[\boxed{\mathbf{702\ (702).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ x² - 4x - 12 = 0\]
\[D = 16 + 48 = 64\]
\[x = \frac{4 \pm 8}{2}\]
\[x_{1} = 6,\ \ x_{2} = - 2\]
\[6 - 2 = 4 = - b\]
\[6 \cdot ( - 2) = - 12 = c\]
\[Ответ:\ \ x = 6;\ \ x = - 2.\]
\[2)\ x² + 9x + 14 = 0\]
\[D = 81 - 56 = 25\]
\[x = \frac{- 9 \pm 5}{2}\]
\[x_{1} = - 7,\ \ x_{2} = - 2\]
\[- 7 - 2 = - 9 = - b\]
\[- 7 \cdot ( - 2) = 14 = c\]
\[Ответ:\ \ x = - 7;\ \ x = - 2.\]