\[y = 2x^{2}\]
\[y = 200:\]
\[2x^{2} = 200\]
\[x^{2} = 100\]
\[x = - 10 \rightarrow y = 200;\]
\[x = 10 \rightarrow y = 200.\]
\[Ответ:( - 10;200);\ \ (10;200).\]