Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 20x^2+57x+40 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * x ^ 2 + 57 * x + 40 <0         (1)

---

    From inequality(1)：
         -8/5 < x < -5/4

---

    The final solution set is :
         -8/5 < x < -5/4

Your problem has not been solved here? Please take a look at the  hot problems ！