Ответ:
\[x^{2} - 4x + 2 = 0\]
\[x_{1} + x_{2} = 4\]
\[x_{1}x_{2} = 2\]
\[2x_{1} + 2x_{2} = 2 \bullet \left( x_{1} + x_{2} \right) =\]
\[= 2 \cdot 4 = 8\]
\[2x_{1} \cdot 2x_{2} = 4x_{1}x_{2} = 4 \cdot 2 = 8\]

\[x^{2} - 4x + 2 = 0\]
\[x_{1} + x_{2} = 4\]
\[x_{1}x_{2} = 2\]
\[2x_{1} + 2x_{2} = 2 \bullet \left( x_{1} + x_{2} \right) =\]
\[= 2 \cdot 4 = 8\]
\[2x_{1} \cdot 2x_{2} = 4x_{1}x_{2} = 4 \cdot 2 = 8\]
