If you're multiplying something with a sum of two or more other values, you can distribute the multiplication to each of the values, then sum the result.
Algebra rules is a project by two of the folks who run The Autodidacts.
A couple of autodidact math enthusiasts, we were looking for all the rules of basic algebra concisely presented in one place. We couldn’t find such a place, so we made Algebrarules.com
These simple rules — applied with a pinch of imagination and a dash of arithmetic — can divide, conquer, and solve just about any practical algebra problem.
If you find errata in the math, bugs in the code of Algebrarules.com, or just want to say Eh, please send us a letter or join us on our roost: @rulesofalgebra.
You've made it all the way to the end! If you found this site useful, pay it forward by helping us help more people learn algebra!