I've tried to do this problem like a thousands times and I just cant get it, can someone people help me? its

[IMG]file:///C:/Users/Samantha/AppData/Local/Temp/moz-screenshot.jpg[/IMG]http://www.webassign.net/www29/latex...a59cf037c7.gif

and all it says on my math homework is to Simplify the Expression. someone please help!! =(