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Maka,
Dengan:
a = m-3, b = 4, c = m
Didapat:
D = b² - 4ac
0 = 4² - 4(m-3)m
0 = 4(4 - m(m-3))
0 = 4 - m(m-3)
0 = 4 - m² + 3m
0 = -m² + 3m + 4
m² - 3m - 4 = 0
(m+1)(m-4) = 0
Maka, didapat:
m = -1 dan m = 4