Chapter 5 - Exponents and Polynomials - 5.2 - Multiplying Monomials - Problem Set 5.2 - Page 200: 59

$-9x^3y+2x^2y+6xy$

Using $a(b+c)=ab+ac$ (or the Distributive Property), the given expression, $ -xy(9x^2-2x-6) ,$ is equivalent to \begin{array}{l}\require{cancel} -xy(9x^2)-xy(-2x)-xy(-6) \\\\= -9x^3y+2x^2y+6xy .\end{array}