Answer
$10x+74$
Work Step by Step
We start with the given expression: $3(x+6)+7(x+8)$
We use the distributive property to expand the expression: $3x+18+7x+56$
We use the commutative and associative properties to group like terms: $3x+7x+18+56$
We combine the like terms using addition: $(3+7)x+18+56=10x+74$