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a = m-1
b = 4
c = 2m
D > 0
b^2 - 4ac > 0
4^2 - 4(m-1)(2m) > 0
16 - 4(2m^2 - 2m) > 0
16 - 8m^2 + 8m > 0
pembuat nol
-8m^2 + 8m + 16 =0 .... dibagi -8
m^2 - m -2 =0
(m + 1 ) ( m-2) = 0
m= -1 atau m = 2
buat garis bilangan
+ - +
.....¤.......¤........
-1 2
D > 0 ( bernilai positif )
maka nilai m yg memenuhi adalah
m < -1 atau m > 2