Answer
$5a^4b^2-5ab^5-5a^2b^3.$
Work Step by Step
By multiplying each term of the polynomial by the factor $5ab^2$, and then adding the products, we have
$$
5ab^2(a^3 - b^3 - ab)=5ab^2(a^3 )+5ab^2(- b^3)+5ab^2( - ab)\\
=5a^4b^2-5ab^5-5a^2b^3.
$$