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thank you 

 

 Oct 9, 2019
 #1
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If (x+4) is a factor, then  x+4 = 0      so  x= -4

   if you put -4 into the origianl equation (this would be f(-4) ) and get any other number besides  0    , then (x+4) is not a factor.....

      can you figure this out now?

 Oct 9, 2019

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