Chapter 1 - Introduction to Algebraic Expressions - 1.2 The Commutative, Associative, and Distributive Laws - 1.2 Exercise Set - Page 17: 82

$3(x+8y)$

The distributive law states that $a(b+c)=ab+ac$ (for real numbers $a$, $b$, and $c$). The greatest common factor for the terms in the given expression is 3. Therefore, we can use the distributive property to factor out 3 from both terms. $3x+24y=3(x+8y)$