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Factor each expression:

`x^2-12 x+27=`  

`x^2-4 x-21=`  

`x^2+3 x-54=`  

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   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
log logn ln n  | | e 
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