Q. Evaluate $\displaystyle \int \frac{6}{x^2}dx$

A. $\displaystyle \int \frac{6}{x^2}dx=-\frac{6}{x}=???$

The evaluation equation has an upper limit of 3 and a lower limit of 1. I couldn't figure out how to show that with LaTEX. As you can see by my answer above, I have it partially completed. I'm stuck on how to finish it.