\[(2x - 8)\left( 2x^{2} - 4x - 30 \right) < 0\]
\[4 \cdot (x - 4)\left( x^{2} - 2x - 15 \right) < 0\]
\[4 \cdot (x - 4)(x - 5)(x + 3) < 0\]
\[Ответ:( - \infty; - 3) \cup (4;5).\]