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x1 - x2 = 2
(√D) / a = 2
{√(b² - 4.a.c)} /a = 2
{√(5² - 4 . 3 . -m) / 3 = 2
√(25 + 12m) = 6 ......kedua ruas pangkatkan 2
25 + 12m = 36
12m = 36 - 25
12m = 11
m = 11/12