(m-1)x^2-mx+1 =2
(m-1)x^2-mx-1=0
x1^2+x2^2=(x1+x2)^2-2x1x2=1
m^2/(m-1)^2+2/(m-1)=1
m^2+2m-2=m^2-2m+1
m=3/4