For a physics-exercise (56b) I have to use the expansion (1+x)^n ~= 1 + n*x when x^2 << 1

Given is that D >> md , how do I make the expansion of (D-md)^-2?

Attachment 20298http://www.mathhelpforum.com/math-he...isc/pencil.png

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- Dec 31st 2010, 12:46 AMBartExpansion
For a physics-exercise (56b) I have to use the expansion (1+x)^n ~= 1 + n*x when x^2 << 1

Given is that D >> md , how do I make the expansion of (D-md)^-2?

Attachment 20298http://www.mathhelpforum.com/math-he...isc/pencil.png - Dec 31st 2010, 02:12 AMCaptainBlack
- Dec 31st 2010, 11:03 AMBart
- Dec 31st 2010, 06:12 PMmr fantastic
- Jan 1st 2011, 05:08 PMBart
Now I see it, you just use the rule A^n * B^n = (A*B)^n.