Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$12x+66$
Using the Distributive Property which is given by $a(b+c)=ab+ac,$ the given expression, $6(2x+11),$ is equivalent to \begin{array}{l}\require{cancel} 6(2x+11) \\\\= 6(2x)+6(11) \\\\= 12x+66 .\end{array}