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Factor each expression:

`x^2-16 x+63=`  

`x^2-3 x-18=`  

`x^2+3 x-40=`  

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   x  x    n  |   | (   ) π DNE
   x    (   ) π DNE
( ) ( ] [ ) [ ] —∞ DNE
< > or All Real Numbers DNE
log logn ln n  | | e 
sin cos tan arcsin arccos arctan  
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