Hey, having a bit of trouble with a substitution problem:

Integrate : x/(2x+1)^1/2 dx using the substitution method

I get 1/3(2x+1)^3/2 - (2x+1)^1/2 + c

The answer is down as 1/3(x-1)((2x+1)^1/2) + c

I cant see how to get to this, any help would be greatly appreciated...