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what is the operation for combining like terms

i dont understand is it just one or more operations

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Gustavo, it would probably be helpful if you presented some examples of the types of problems you are working on.  Are you not understanding what a like term is, or just how to combine, or do you have something a little more complex?

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1 Answer

Hello,
 
Let's say you have  7(2x - 4) + (7 + 5x)
 
Combining like terms needs to be done after when you have expanded the terms in the brackets:
 
you will multiply (2x - 4) by 7 to get  14x - 28
 
then try to combine the like terms in this form
 
14x -28 + (7 + 5x)
 
14x - 28 + 7 + 5x
 
5x and 14x are like terms so as well as 7 and - 28
 
now we have
 
14x + 5x  +7 - 28
 
Solving this we get:
 
19x -21
 
I hope this helps.