## Appendix A. Leftovers: The Top Five Things (we didn’t cover)

### Note

Yes, just five. You’ve learned so much already...

**You’ve learned a lot in this book, but Algebra has even more to
offer.** Don’t worry, we’re almost done! Before we go, there are just a few gaps we
want to fill in. Then you’ll be onto Algebra 2, and that’s a whole additional book...

We touched on them in Chapter 3, but as a quick
refresher, here’s what a negative exponent looks like:

Combine that rule with multiplying exponential terms, and you can
divide exponential terms too, like this:

What’s going on here? It’s really a matter of cancelling things
out... here’s a simple example, where you can see the cancelling in
action:

A negative exponent means that you divide one by the exponential
term, with its exponent stripped of its negative sign. Negative
exponents are a great way to get rid of fractions. Any fraction can be
rewritten as a negative exponent, and you can work with it the same way
you would work with any other exponent.

**Negative exponents mean you can get rid
of fractions.**

## Working with negative exponents ...