I was working on some new homework and I'm having a hard time antidifferentiating problems like these:

$\displaystyle \int_2^5 (3-(6/x))^2dx$

For this one, I tried multiplying it out and got

$\displaystyle {\int _2^5 (9-36/x+36/x^2)}dx$

and tried to use that to find the integral, but I ran into the problem of having to differentiate $\displaystyle 36/x^2$

Another problem that I can't do is

$\displaystyle x={\int_0^y\sqrt{9t^2+6t}dt}$ for when y is greater than or equal to 1 and less than or equal to 5.

On this problem, I have to find the length of the curve. I know the process, but I can't do it if I can't antidifferentiate that equation.