\[(4x - 3)^{2} - 6x(4 - x) =\]
\[= 16x^{2} - 2 \cdot 12x + 9 - 24x + 6x^{2} =\]
\[= 22x^{2} - 24x + 9 - 24x =\]
\[= 22x^{2} - 48x + 9.\]