http://i498.photobucket.com/albums/r...s1010/help.jpg

Can anyone explain to me what happened in this step?

I don't understand mainly where the 2 came from nor the x^(1/2) + x

Printable View

- Jul 16th 2009, 07:17 PMBrazucaDefinite Integral
http://i498.photobucket.com/albums/r...s1010/help.jpg

Can anyone explain to me what happened in this step?

I don't understand mainly where the 2 came from nor the x^(1/2) + x - Jul 16th 2009, 07:22 PMarbolis
Because $\displaystyle (a+b)^2=a^2+2ab+b^2$. (see the "$\displaystyle 2ab$" part).