\[y² + 7y - 8 = 0\]
\[y_{1} + y_{2} = - 7\]
\[y_{1} \cdot y_{2} = - 8 \Longrightarrow y_{1} = - 8;\ \ y_{2} =\]
\[= 1\]
\[Ответ:\ \ y_{1} = - 8;\ \ y_{2} = 1.\]