Skeeter, I think I got it now! (for this problem type)
I was looking at what was going on in this post.
http://www.mathhelpforum.com/math-he...161-post5.html
So what I did was this.
Divide everything by 2:
(I did this step because I thought it would be easier to get my end result )
Differentiate:
(To respect of 'x' of course)
Becoming:
Next:
Final:
Just tell me, did I do anything illegal.