My Math Forum electromagnetism Problem

 Physics Physics Forum

August 5th, 2017, 03:04 PM   #1
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Joined: Jan 2014

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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
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 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 $|z + \frac{d}{2}|^2$. Thanks from mdocka1 Last edited by Joppy; August 5th, 2017 at 05:05 PM.

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