1) (x - 4)(2x + 8) > 0
2(x - 4)(x + 4) > 0
(x - 4)(x + 4) > 0
+ - +
____________₀____________₀__________
- 4 4
x ∈ (- ∞ ; - 4) ∪ (4 ; + ∞)
2) (4x + 16)(5x + 20)(2x - 30) > 0
4 * 5 * 2 * (x + 4)(x + 4)(x - 15) > 0
(x + 4)²(x - 15) > 0
- - +
___________₀___________₀___________
- 4 15
x ∈ (15 , + ∞)