Ответ:
\[x^{2} - 7x - 1 = 0\]
\[x_{1} + x_{2} = 7\]
\[x_{1}x_{2} = - 1\]
\[5x_{1} + 5x_{2} = 5 \bullet \left( x_{1} + x_{2} \right) =\]
\[= 5 \cdot 7 = 35\]
\[5x_{1} \cdot 5x_{2} = 25x_{1}x_{2} =\]
\[= 25 \cdot ( - 1) = - 25\]

\[x^{2} - 7x - 1 = 0\]
\[x_{1} + x_{2} = 7\]
\[x_{1}x_{2} = - 1\]
\[5x_{1} + 5x_{2} = 5 \bullet \left( x_{1} + x_{2} \right) =\]
\[= 5 \cdot 7 = 35\]
\[5x_{1} \cdot 5x_{2} = 25x_{1}x_{2} =\]
\[= 25 \cdot ( - 1) = - 25\]
