\[x^{2} - 19x + q = 0\]
\[x_{1} = x_{2} + 3\]
\[\left\{ \begin{matrix} x_{1} + x_{2} = 19 \\ x_{1} \cdot x_{2} = q\ \ \ \ \\ \end{matrix} \right.\ \]
\[x_{2} + 3 + x_{2} = 19\ \ \]
\[2x_{2} = 16\]
\[x_{2} = 8.\]
\[x_{1} = 8 + 3\]
\[x_{1} = 11.\]
\[11 \cdot 8 = q \Longrightarrow q = 88.\]
\[Ответ:\ \ x_{1} = 11;\ \ x_{2} = 8;\ \ \]
\[q = 88.\]