\[4x \cdot (2x - 4) - 6x \cdot (3x - 2) =\]
\[= 8x^{2} - 16x - 18x^{2} + 12x =\]
\[= - 10x^{2} - 4x\]
\[если\ x = - 8:\ \ \ \ \ -\]
\[- 10 \cdot 64 + 32 = - 608.\]