Connection of mathematics knowledge between junior high school and senior high school (1) 2. According to the graph of quadratic function y = AX2 + BX + C (a > 0), we discuss the solution set of the following inequality (expressed by interval) （1）ax2+bx+c>0 (a>0)； （2）ax2+bx+c0)．

Connection of mathematics knowledge between junior high school and senior high school (1) 2. According to the graph of quadratic function y = AX2 + BX + C (a > 0), we discuss the solution set of the following inequality (expressed by interval) （1）ax2+bx+c>0 (a>0)； （2）ax2+bx+c0)．

If the right side of the inequality is greater than or equal to o, then the solution set of the inequality is to take the outer two parts of the equation (greater than both sides) and vice versa. Note: the precondition is that the coefficient of the quadratic term must be greater than 0