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April 16th, 2014, 04:21 AM  #1 
Newbie Joined: Apr 2013 Posts: 23 Thanks: 0  Canceling fractions
Hello! Why can I only cancel in this way: π₯=(4Β±β4 β10)/2 > π₯=(4Β±2 β10)/2 and not this =(2Β±2β10)/2 The question is why the denominator terminates only to the two of the numerator and not to the four? 
April 16th, 2014, 05:24 AM  #2 
Senior Member Joined: Apr 2014 From: Greater London, England, UK Posts: 320 Thanks: 156 Math Focus: Abstract algebra 
There is no cancelling there. Itβs just $\sqrt4=2$.

April 16th, 2014, 09:59 AM  #3 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039  

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