\[m^{2} + 8m - 9 = 0\]
\[m_{1} + m_{2} = - 8\]
\[m_{1} \cdot m_{2} = - 9\]
\[\Longrightarrow m_{1} = - 9;\ \ m_{2} = 1.\]
\[m^{2} + 8m - 9 = (m + 9)(m - 1).\]
\[m^{2} + 12m + 27 = 0\]
\[m_{1} + m_{2} = - 12\]
\[m_{1} \cdot m_{2} = 27\]
\[\Longrightarrow m_{1} = - 9;\ \ m_{2} = - 3.\]
\[m^{2} + 12m + 27 =\]
\[= (m + 9)(m + 3).\]