(2х+6)(х+4)>0
(2x + 6)·(x + 4) > 0 2·(x + 3)·(x + 4) > 0 (x + 3)·(x + 4) > 0 -4 -3 ---o---o---> x + - + x ∈ (-∞; -4) ∪ (-3; +∞)