Jawabanmu

2014-01-18T22:23:20+07:00
D=b^2-4ac
D= (2m-2)^2-4(1)(4)
D=4m^2-8m+4-16
D=4m^2-8m-12 (masing masing dibagi 4)
D=m^2-2m-3
(m+1)(m-3)=0
m=-1 atau m=3