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x² - 16 < 9
x² - 25 < 0
(x + 5)(x - 5) < 0
-5 < x < 5
x² - 16 > 0
(x + 4)(x - 4) > 0
x < -4 atau x > 4
Hp = {x| -5 < x < -4 atau 4 < x < 5, x∈R}