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a= 1, b =- (m+3) , c = m+6
akar kembar -->D = 0
b² = 4 ac
(-m-3)² = 4(1)(m+6)
m² + 6 m + 9 = 4m + 24
m² + 2m - 15 =0
(m + 5)(m - 3) = 0
m = -5 atau m = 3