Calculate: (x^2-4) * (8x-9)

Expression: $\left( {x}^{2}-4 \right) \times \left( 8x-9 \right)$

${x}^{2} \times 8x-9{x}^{2}-4 \times 8x-4 \times \left( -9 \right)$

$8{x}^{3}-9{x}^{2}-4 \times 8x-4 \times \left( -9 \right)$

$8{x}^{3}-9{x}^{2}-32x-4 \times \left( -9 \right)$

$8{x}^{3}-9{x}^{2}-32x+36$