x1+x2=-2(m-1)
x1x2=3m^2-11
x2/x1+x1/x2=-1
x2^2+x1^2=-x1x2
(x1+x2)^2=x1x2
4(m-1)^2=3m^2-11
4m^2-8m+4=3m^2-11
m^2-8m+15=0
解得m=3 m=5
x1+x2=-2(m-1)
x1x2=3m^2-11
x2/x1+x1/x2=-1
x2^2+x1^2=-x1x2
(x1+x2)^2=x1x2
4(m-1)^2=3m^2-11
4m^2-8m+4=3m^2-11
m^2-8m+15=0
解得m=3 m=5