Hey, Got a Maths exam tomorrow and I'm having a bit of trouble trying to get the answer given in the back of the book for this problem:

I have to differentiate this:

x/(x+1)^1/2 The answer in the back is x+2/2(x+1)^3/2

I get to: (((x+1)^-1/2) -1/2x.((x+1)^-3/2))/(x+1)

But I can't make the jump from this line to the answer :/.