**Note: Due to a delay in our completion of Friday’s lesson, this assignment will be postponed for Monday, February 3**

We’ve started the second section of Unit 4, learning about complex and imaginary numbers. This is a new category of number, much like irrational or negative numbers, that mathematicians developed to handle equations that they previously had no ability to solve. We watched two videos to introduce this topic, but I recommend you watch the full story found here.

## Today’s Files

- Copy of class notes
- HW 4.9 – Introduction to Complex Numbers
- Lesson Video (simplifying radicals with negative radicands)
- Video Archive

## Cumulative IXL Modules

The log-in procedure for IXL has changed. See this post for updated instructions