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x² + (m-2)x + 9 = 0
a = 1
b = m-2
c = 9
D = b² - 4ac
b² - 4ac = 0
(m-2)² - 4(1)(9) = 0
m² - 4m + 4 - 36 = 0
m² - 4m - 32 = 0
(m + 4)(m - 8)
m + 4 = 0
m = -4
m - 8 = 0
m = 8
Jadi m = -4 atau m = 8