Exactly. Unfortunately, there isn't a 1/2 inside the integral, so you can't substitute yet. Fortunately, you can place a 1/2 inside the integral as long as you place a 2 outside the integral (to balance the 1/2). Now, the problem looks like:
Substituting and gives:
Strictly speaking, what you wrote here was
but apparently you meant
which would be e^(x^(1/2))/x^(1/2)
I started out with u substitution. First I let radical x be u, but I couldn't work it out properly because I didn't know what to cross out. Please give me some insight on this!