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penyelesaian :
syarat tdk mempunyai akar real : D<0
b² - 42 c < 0
(-2 -2m )² - 4(1) (3m + 3 ) < 0
4 + 8m + 4m² - 12 m < 0
4m² - 4m - 8 < 0
m² - m - 2 = 0
(m-2) (m+1) = 0
jadi , m₁ =2 & m₂ = -1