What is the product of (4x 3)(-2x - 5)?

To find the product of ((4x^3)(-2x - 5)), we use the distributive property. Multiplying (4x^3) by each term in the second expression gives us:

[ 4x^3 \cdot -2x = -8x^4 ] and [ 4x^3 \cdot -5 = -20x^3. ]

Thus, the final product is (-8x^4 - 20x^3).