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D = 0
b kuadrat - 4ac = 0
(-2m+2)(-2m+2) - 4 .4 . 9 = 0
4mkuadrat - 4m -4m + 4 - 144 = 0
4mkuadrat - 8m - 140 = 0 (semua dibagi 4)
m kuadrat - 2m - 35 = 0
(m +7 ) (m - 5) = 0
m+7 = 0
m=-7
atau
m-5=0
m=5