\[y = x^{2} + px + q;\ B\ (3;\ - 7).\]
\[x_{0} = - \frac{p}{2}\]
\[3 = - \frac{p}{2}\text{\ \ \ }\]
\[p = - 6.\]
\[- 7 = 9 + 3 \cdot ( - 6) + q\]
\[- 7 = 9 - 18 + q\ \ \]
\[q = 2.\]
\[Ответ:при\ p = - 6;\ \ q = 2.\]