By tpm | July 28, 2010

Imaginary numbers can be a source of confusion when they are first introduced to a student, but they don’t have to be. Basically, we are trying to deal with the problem of the square root of a negative number. When we take the square root of negative one, the number is called **i**.

This video lesson includes a brief explanation of complex numbers and a tutorial on how to use your TI-Nspire to do calculations involving complex numbers. It covers square roots of negative numbers, multiplying complex numbers, and rationalizing complex numbers. An Nspire can make complex numbers simple, even easy, but you’ll want to follow along with the review of complex numbers by hand first.