Chapter 5 - Exponents and Polynomials - 5.3 - Multiplying Polynomials - Problem Set 5.3 - Page 207: 20

$4n^2+27n+18$

Using the Distributive Property and then combining similar terms, the given expression, $ (4n+3)(n+6) ,$ is equivalent to \begin{array}{l}\require{cancel} 4n(n)+4n(6)+3(n)+3(6) \\\\= 4n^2+24n+3n+18 \\\\= 4n^2+27n+18 .\end{array}