📢 QuizNe.vn will officially cease operations on 27/08/2026. Thank you for being with us.
- $ y = - 2{x^3} + x$.
- $ y = \\\frac{{x + 4}}{{x + 1}}$.
- $ y = - {x^4} - {x^2}$.
- $ y = - 2{x^3} + 2{x^2} - 7x + 5$.