The square root of a negative number still isn’t real, but now we can label it with an “i”
and do some work with it. When you find a quotient, it’s like the binomial denominators
in previous sections. Instead of hauling around a radical, however, you take along “i”
and remember that i-squared is - 1.
When you are dividing, think of those radicals from previous sections. They are a lot
like these. You are using that difference of squares pattern again.