根据题意
m-3≠0,m≠3
2m^2-3m-7=2
2m^2-3m-9=0
(2m+3)(m-3)=0
m=-3/2或m=3舍去
所以m=-3/2
(m-1)^2
=(-3/2-1)^2
=(-5/2）^2
=25/4