Find the product of 5x^3 and -8x^2 + 10

a. -40x^9 + 50x^3
b. -40x^5 + 50x^3
c. -40x^5 + 10
d. 5x^3 - 8x^2 + 10
.

The product of 5x^3 and -8x^2 + 10 is -40x^5 + 50x^3.

Therefore, the correct answer is:
b. -40x^5 + 50x^3