The next problem is a fraction with a negative exponent on top, but only positive exponents on the bottom:

The x^-2 on top of the fraction bar is moved below it, and its exponent is changed from negative two to positive two. Since there is already x² on the bottom, they are multiplied together. The number 1 is left on the top of the fraction because, as you may recall, when a term does not have an explicit coefficient, it has an implicit coefficient of 1.

The next page links to various negative exponent resources.