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b² - 4ac ≥ 0
(5m - 3)² - 4(2)(6m) ≥ 0
24m² - 30m + 9 - 48m ≥ 0
24m² - 78m + 9 ≥ 0
8m² - 26m + 3 ≥ 0
akar2nya = (-b +- √b² - 4ac)/2a
= (26 +- √(676 - 4(8)(3))/2(8)
= (26 +- √(676 - 96))/16
= (26 +- √580)/16
x1 = (26 + √580)/16
x2 = (26 - √580)/16
HP: {x | x ≥ (26 + √580)/16 atau x ≤ (26 - √580)/16}