Find the length of the curve:

for

If I understand correctly, Length = integral from 1 to 2 of

So in this case, I need to find y' and substitute it in the formula and then find the integral.

y =

Then I plug in y' into the formula to get (integral from 1 to 2)

L = I'm not sure where to go from here to make the integration work. I've been stuck on this for a while, so if anyone could help, I'd appreciate it!