If sets A and B are not empty sets, the discriminant of the equation should be △≥0, should be: m ≤-3/2, and the equation should have at least one negative root.
1, if the equation has two negative roots, then: x1+x2 = 2; 0, there is no solution at this time;
2. If there is only one negative root, then: x 1x2 = 2m+4.
Therefore, the range of m is: m.