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b²-4ac>0
(-4m)²-4. m. 2>0
16m²-8m>0 (dibagi 8)
2m²-m>0
m(2m-1)>0
m=0 atau 2m-1=0
m=1/2
buat garis bilangan
+++ ---- +++
0 1/2
jadi nilai m adalah m<0 atau m>1/2