In Ramakrishna's paper, http://arxiv.org/ftp/arxiv/papers/1111/1111.1922.pdf , he derived equation (9), page 5.(adsbygoogle = window.adsbygoogle || []).push({});

It is a difference of two square-roots using an approximation method. Can anyone help in how this is done?

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Question about taking the difference between two square root expression

**Physics Forums | Science Articles, Homework Help, Discussion**