August 5th, 2017, 03:04 PM  #1 
Member Joined: Jan 2014 Posts: 42 Thanks: 0  electromagnetism Problem
Hi I would like to now how the numerator became 4 in the problem attached. Its a complex fraction but I am unsure how Qaz became 4Qaz. Thanks 
August 5th, 2017, 04:51 PM  #2 
Member Joined: Jan 2014 Posts: 42 Thanks: 0 
Sorry I realise I should have posted this in a more appropriate thread. As the problem is for electromagnetism but my question is relating to fractions. My apologies. Any help is appreciated 
August 5th, 2017, 05:03 PM  #3 
Senior Member Joined: Feb 2016 From: Australia Posts: 1,361 Thanks: 467 Math Focus: Yet to find out. 
$ z  \frac{d}{2} ^2 = \frac{1}{4} 2z  d^2 $. Similar is true for $ z + \frac{d}{2}^2$.
Last edited by Joppy; August 5th, 2017 at 05:05 PM. 

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