Our test on Unit 4 will be on **Friday, January 19th**. Please do not be absent on that day! If you know for some reason that you will be absent on that day, please arrange a time **before the 19th** to take the test! Otherwise, we will have to schedule a time for you to take the test during exam week!

Our last “new” topic from Unit 4 was a revisitation to the solving of quadratic equations. Recall that the decision to permit the square root of negative numbers was motivated partly by allowing all quadratic equations to have solutions, so today we spent some time talking about how to write/solve these equations. Your homework is HW 4.13 – Solving Quadratics with Nonreal Roots. You can find the notes here and some more examples in this video.

**Cumulative IXL Review Modules **(newly added modules are in **bold**)

- H.4 – Multiply complex numbers
- H.5 – Divide complex numbers
- H.6 – Add, subtract, multiply, and divide complex numbers
- H.8 – Powers of i
**J.4 – Solve a quadratic equation using square roots (includes nonreal roots)****J.6 – Solve a quadratic equation by factoring (no nonreal roots)****J.9 – Solve a quadratic equation using the quadratic formula (includes nonreal roots)**- L.4 – Simplify radical expressions with variables I
- L.5 – Simplify radical expressions with variables II
- L.6 – Nth roots
- L.7 – Multiply radical expressions
- L.8 – Divide radical expressions
- L.9 – Add and subtract radical expressions
- L.10 – Simplify radical expressions using the distributive property