- $ (P):y = - \\\frac{1}{4}{x^2} - 3x - 1$.
- $ (P):y = - \\\frac{1}{4}{x^2} - x - 1$.
- $ (P):y = - \\\frac{1}{4}{x^2} + x - 1$.
- $ (P):y = - \\\frac{1}{4}{x^2} + 2x - 1$