Hello, I'm a freshman in highschool trying to get a headstart into calculus, so please excuse my limited knowledge in the subject.

Anyways, I have this integral

$\displaystyle \int_2^8{\left(\frac{x}{8} - \frac{2}{x^2}\right)} dx$

I have some sort of idea on how to solve it. Something about taking the anti-derivative.

The answer is 3, but I would like to know how to get there step by step, I'm having a hard time comprehending my calculus book.