根据题意
2m+1≠0
m≠-1/2
判别式=16m²-4(2m+1)(2m-3)≥0
4m²-(2m+1)(2m-3)≥0
4m²-4m²+4m+3≥0
4m+3≥0
m≥-3/4
所以m≥-3/4且m≠-1/2