Multiply :

-8x and 4 - 2x - x²

-8x $\times$ (4 - 2x - x²)

= (-8x) $\times$ 4 - (-8x) $\times$ 2x - (-8x) $\times$ x²

= -32x + 16x⁽¹⁺¹⁾ + 8x⁽¹⁺²⁾

= -32x + 16x² + 8x³

Hence, (-8x) x (4 - 2x - x²) = -32x + 16x² + 8x³