# How do you use the distributive property to factor 21b-15a?

Mar 25, 2017

See the solution process below:

#### Explanation:

First, factor a $\textcolor{red}{3}$ from each term and rewrite the expression as:

$\left(\textcolor{red}{3} \cdot 7 b\right) - \left(\textcolor{red}{3} \cdot 5 a\right)$

Now, factor the $\textcolor{red}{3}$ out of both terms:

$\textcolor{red}{3} \left(7 b - 5 a\right)$