1. Sec 5: Operations with Complex Numbers
Learning Target: I will add, subtract and multiply complex numbers.
Sec 5: Operations with Complex Numbers
Homework: Pg 250 #18-32 all, even

2. Quality Core Practice
* Can you do it without a Calculator?

3. Ex 1: Generating Patterns with i
𝑖= −1
𝑖 2 =
𝑖 3 =
𝑖 4 =
𝑖 5 =
𝑖 6 =
𝑖 7 =
𝑖 8 =
Do you notice a pattern?
What would 𝑖 25 be the same as?

4. Ex 2: Adding & Subtracting
(5 + 7i) + (-2 + 6i)
(8 + 3i) – (2 + 4i)
7 – (3 + 2i)
(4 – 6i) + 3i

5. Ex 3: Multiplying Complex Numbers
Remember!
𝑖 should remain 𝑖…so avoid using −1 .
𝑖 2 =−1, which you do want to use to simplify.
(5i)(-4i)
(12i)(7i)
(2 + 3i)(-3 + 5i)
(6 – 5i)(4 – 3i)

6. Ex 4: Holy Crap!
What is the product of 3i, 2i – 4 and -4i?

7. HOMEWORK
Pg 250 #18-32 all, even