Factoring
2) Factoring Trinomials of
3) Factoring the difference of two squares
4) Perfect square trinomials.
Factoring is only the distributive Law in reverse. If we have  ,
we may factor out c because  .
The expression 
can also be factored to be 
. Because if we multiply each element in one factor by each element
in the other factor, we get  .
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