Griffiths Page 146: Understanding Binomial Expansion

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The discussion centers on a query regarding the binomial expansion referenced on page 146 of David J. Griffiths' "Introduction to Electrodynamics." The user seeks clarification on the specific binomial expansion mentioned and the derivation of the second approximate equality, particularly the elimination of the ( )^(-1/2) operation. The solution is found in equation 3.93 of the text, which provides the necessary context for understanding the approximation used in the derivation.

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[SOLVED] Griffiths page 146

Homework Statement


EDIT: sorry I realized I posted this in the wrong forum; someone can move it to the advanced physics forum if you want

Please stop reading unless you have Griffiths E and M book.

On that page, Griffiths says "and then the binomial expansion yields" and I am not sure what binomial expansion he is talking about. On the next line how did he get the second approximate equality? How in the world did he get rid of the ( )^(-1/2) operation ?

Homework Equations


The Attempt at a Solution

 
Last edited:
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Never mind. See equation 3.93.
 

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