\[\boxed{\text{312.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[1)\ x^{2} - 4x - 12 = 0\]
\[D_{1} = 4 + 12 = 16\]
\[x_{1} = 2 + 4 = 6;\ \ x_{2} = 2 - 4 =\]
\[= - 2.\]
\[2)\ x^{2} - 10x + 24 = 0\]
\[D_{1} = 25 - 24 = 1\]
\[x_{3} = 5 + 1 = 6;\ \ \ x_{4} = 5 - 1 = 4.\]
\[Ответ:x = 6.\]
\[1)\ x^{2} + 15x + 50 = 0\]
\[x_{1} + x_{2} = - 15;\ \ \ x_{1} \cdot x_{2} = 50\]
\[x_{1} = - 5;\ \ \ x_{2} = - 10.\]
\[2)\ x^{2} + 7x + 10 = 0\]
\[x_{1} + x_{2} = - 7;\ \ \ x_{1} \cdot x_{2} = 10\]
\[x_{1} = - 5;\ \ \ x_{2} = - 2.\]
\[Ответ:x = - 5.\]