Answer
$8x+36$
Work Step by Step
Using the Distributive Property and then combining like terms, the given expression, $
3(x+2)+5(x+6)
,$ simplifies to
\begin{array}{l}\require{cancel}
3x+6+5x+30
\\\\=
(3x+5x)+(6+30)
\\\\=
8x+36
.\end{array}