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