Expanding single brackets
It can be very useful to be able to expand a single bracket, such as 3(x + 2).
This is really easy to do if you remember two things:
The number outside the bracket means "multiply everything inside this bracket by me". Written out properly, it should say 3 x (x + 2), but this looks really confusing. Is that an x outside the bracket or a multiplication sign? 3(x + 2) looks far less confusing as long as we understand what that 3 is doing there. To expand the bracket, all we do is multiply x by 3, to get 3x, and 2 by 3 to get 6. So when we expand 3(x + 2), we get 3x + 6. 
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