\[2x(3x - 1)(2x + 5) =\]
\[= \left( 6x^{2} - 2x \right)(2x + 5) =\]
\[= 12x^{3} + 30x^{2} - 4x^{2} - 10x =\]
\[= 12x^{3} + 26x^{2} - 10x\]