Упростите выражение: 8(3x+y)^2-12x(6x+4y).

\[8(3x + y)^{2} - 12x(6x + 4y) =\]

\[= 8\left( 9x^{2} + 6xy + y^{2} \right) - 72x^{2} - 48xy =\]

\[= 72x^{2} + 48xy + 8y^{2} - 72x^{2} - 48xy =\]

\[= 8y^{2}.\]