Question

(2х+6)(х+4)>0

Answer 1

(2x + 6)·(x + 4) > 0
2·(x + 3)·(x + 4) > 0
(x + 3)·(x + 4) > 0
  
   -4  -3
---o---o---> x
 +    -    +

x ∈ (-∞; -4) ∪ (-3; +∞)