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syarat D > 0
b² - 4.a.c > 0
(- 3n - 2)² - 4 .(n - 2)(4n + 1) > 0
9n² + 12n + 4 - 16n² + 28n + 8 > 0
- 7n² + 40n + 12 > 0
(- 7n - 2)(n - 6) > 0
batas n adalah < x < 6