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1/4 x² < 6 + 10
1/4 x² < 16
x² < 16 . 4
x² < 64
x² - 64 < 0
(x + 8) (x - 8) < 0
<-----------o========o--------->
- 8 8
Hp = { x / - 8 < x < 8 ; x ∈ R }