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- $ (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$