Trong mặt phẳng tọa độ Oxy .Cho parabol (P) :Y =-x²

a: Vẽ đồ thị P

Giúp mình vs ạ

`(P):y=-x^2`

\begin{array}{|c|c|c|c|c|c|}\hline \text{x}&\text{-2}&\text{-1}&\text{0}&\text{1}&\text{2}\\\hline \text{y}&\text{-4}&\text{-1}&\text{0}&\text{-1}&\text{-4}\\\hline\end{array}