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dari soal diperoleh : a = m + 1; b = 2m - 2; c = m - 2
sehingga : D = 0
bkuadrat - 4.a.c = 0
(2m - 2)kuadrat - 4(m +1).(m - 2) = 0
4mkuadrat - 8m + 4 - 4( mkuadrat - m - 2) = 0
4mkuadrat - 8m + 4 - 4mkuadrat + 4m + 8 = 0
- 4m = - 8 - 4
- 4m = - 12
m = - 12/ - 4
m = 3