\[y² - 10y - 39 = 0\]
\[y_{1} + y_{2} = 10\]
\[y_{1} \cdot y_{2} = - 39 \Longrightarrow y_{1} = 13;\ \ \]
\[y_{2} = - 3\]
\[Ответ:\ \ y_{1} = 13;\ \ y_{2} = - 3.\]