(adsbygoogle = window.adsbygoogle || []).push({}); Math problem (picture) (second problem added)

Can anyone explain this simplification?

http://img379.imageshack.us/img379/1786/maproblem1bm.jpg [Broken]

Kindly Paul-MArtin

**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!

# MAth problem (picture)

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