1. October 13th Warm up with partners
Real & imaginary part; pure imaginary # has no real part
complex #’s
real #’s imaginary #’s
irrational #’s
rational #’s
5 – 6i
5,-2,0.7,1/2,1/3
Non-repeating decimals
Repeating &
terminating decimals
too
Give examples &
define each type of #.

2. Go over quiz #2

3. Important to know all of these…..1 -1
-1i
= -i 1

4. Imaginary Number Review from Alg 2: 1) 2)
1) 2) 4) 5) 4i bi
8 + i
2i + 7i = 9i
2i (5i) = 10i2 = -10
Take the i out first

5. Let’s practice arithmetic with complex numbers…..
(2 + 3i) – (4 – 6i)
7) 3i(6 – 7i)
8) (5 – 4i)(-4 + 6i)
9) (2 + 3i)(5 – 3i)
-2 + 9i i
4 + 46i
Foil, combine like terms…
Be sure your answer is in standard form!!!
19 + 9i

6. Homework
WS 3-7