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jika memiliki akar kembar maka D = 0
0 = D
0 = b² - 4ac
0 = (2m)² - 4 . 1 . ( 5m - 4 )
0 = 4m² - 20m + 16
disederhanakan, dibagi 4 semua menjadi
0 = m² - 5m + 4
0 = ( m - 1 ) ( m - 4 )
jadi nilai m = 1 ∨ m = 4