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-> 2x² - x - 15 > 0
(2x + 5) (x - 3) > 0 [Kalau kamu coba kalikan lalu tambahkan pasti hasilnya 2x² - x - 15]
2x = -5
x = - 2,5 atau x = +3
Jadi HP = {-2,5 > x > 3}
Semoga dapat membantu ^ ^
Mohon maaf jika terdapat kesalahan dan kekurangan