Algebrarules.com

The most useful rules of basic algebra,
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Howdy! Here are a few very handy rules of algebra. These basic rules are useful for everything from figuring out your gas mileage to acing your next math test — or even solving equations from the far reaches of theoretical physics. Happy calculating!

Algebra Rule 1

Multiplication can be distributed across addition

$$a(b+c) = ab+ac$$
Description:

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.

$$3(4+5) = 3*4 + 3*5 = 27$$
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