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