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b=-(m-6)
c=2
syarat akar real : D≥0
b²-4ac≥0
(-(m-6))²-4.m.2≥0
(m-6)²-8m≥0
m²-12m+36-8m≥0
m²-20m+36≥0
m=18 atau m=2
maka m≤2 atau m≥18