\[y = - 25x^{2}\]
\[C\left( \frac{1}{5}; - 1 \right):\]
\[- 1 = - 25 \cdot \left( - \frac{1}{5} \right)^{2}\]
\[- 1 = - 25 \cdot \frac{1}{25}\]
\[- 1 = - 1\]
\[принадлежит.\]