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October 8th, 2018, 10:43 AM  #1 
Senior Member Joined: Apr 2017 From: New York Posts: 106 Thanks: 6  rational expression simplification
Hi everyone, I couldn't do this: (x^2y^24y4) / (x^2y^24y+4) any idea? 
October 8th, 2018, 12:52 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,610 Thanks: 617 
Add and subtract 8 to the numerator. Get 1 +8/denominator.

October 8th, 2018, 03:56 PM  #3 
Senior Member Joined: Apr 2017 From: New York Posts: 106 Thanks: 6 
Did you mean 1  8/denominator? because if I add and subtract 8 what I get on numerator is exactly the same as denominator 8 
October 8th, 2018, 06:12 PM  #4  
Senior Member Joined: May 2016 From: USA Posts: 1,148 Thanks: 479  Quote:
$\dfrac{z  a}{z + a} = \dfrac{z  a + 0}{z + a} = \dfrac{z  a + 2a  2a}{z + a} = \dfrac{z + a  2a}{z + a} = \dfrac{z + a}{z + a}  \dfrac{2a}{z + a}= WHAT?$ What is the relevance of this general idea to your specific problem? Last edited by JeffM1; October 8th, 2018 at 06:21 PM.  
October 9th, 2018, 01:22 PM  #5 
Global Moderator Joined: May 2007 Posts: 6,610 Thanks: 617  

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expression, rational, simplification 
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