You probably should submit a new question in a new post.
Another suggestion. Try to learn a little LATEX to help present you problems a little better. Just click on the code below to see how this one is constructed.
The square root of is |2x+ 1|, which is not necessarily equal to 2x+ 1. For example, if x= -2 then 2x+ 1= 2(-2)+ 1= -3 so . The square root of that is 3, not -3.
Last edited by mr fantastic; April 23rd 2009 at 07:04 AM.
Reason: Fixed a latex tag.