Hi, the brackets are not in the original equation, I've just added them to make it simpler.
The original equation is (x/1)-(1/x1/2)dx
I got up to
(x2/2)-(x1/2/1/2)
I'm pretty sure it is correct up until then, I'm unsure were to go from there... The numbers we sub in are 9 & 4 respectively.