\[y = - 2x^{2}\]
\[y = - 1400x:\]
\[- 2x^{2} = - 1400x\]
\[- 2x^{2} + 1400x = 0\]
\[- 2x(x - 700) = 0\]
\[x = 0;\ \ \ x = 700.\]
\[Ответ:(0;0);\ \ (700;\ - 980\ 000).\]