(1-4m)/8m-(3-1m^2)/2m^2
\(\Large\frac{1-4m}{8m}-\frac{3-m^2}{2m^2}\)
\(\Large=\frac{m(1-4m)-4(3-m^2)}{8m^2}\)
\(\Large=\frac{m-4m^2-12+4m^2}{8m^2}\)
\(\Large =\frac{m-12}{8m^2}\)
!
!
