We can see that the terms 15x and 6 share a common divisor, 3. By the Distributive Property, we can take the 3 out of both terms and set it in front of a set of parentheses containing the sum of the two terms. This would look like this:
[tex]15x + 6 = 3(5x + 2)[/tex]
Thus, our answer is C, 3(5x + 2).
