The last thing you need to know to make algebra II your best friend is how imaginary numbers work. They might sound really abstract at first, but they’re not. In fact, imaginary numbers, which are represented as *i*, have a really specific definition.

So what’s the big deal with imaginary numbers? Well, they’re really important for finding the roots of polynomials and solving complex trigonometry and calculus problems. But for now, all you need to know is that *i *works just like *x*.

The distributive law, FOIL, and all other math laws work exactly the same for *i* as they do for *x*, except whenever we see *i²* we substitute it with -1. That’s it!

Now that you know how functions, graphing inequalities, and imaginary numbers work, you’ll have no problem becoming best friends with algebra II. For more explanations about these topics, read the rest of this series and check out Brightstorm Algebra 2.