\[2x^{2} - 4x - 6 = 0\ \ \ \ \ |\ :2\]
\[x^{2} - 2x - 3 = 0\]
\[x_{1} + x_{2} = 2;\ \ \ x_{1} \cdot x_{2} = - 3\]
\[x_{1} = 3;\ \ \ \ x_{2} = - 1\]
\[\Longrightarrow x = - 1;\ \ \ y = 0.\]
\[Ответ:\ \ A( - 1;0).\]