1. Precalculus Section 1.5 Perform basic operations with complex numbers The basic imaginary unit is i. i = i 2 = -1 A complex number is any number that can be written in the form a + bi, where a and b are real numbers a is the real part and bi is the imaginary part.

2. Complex numbers Simplify - 2

3. Simplify ( 2 + 3i) + (4 – 5i) (9 – 6i) – (3 – 7i) (2 + 5i)(6 – i) 5 – 2i 4 + 3i

4. Powers of i i 1 = i i 2 = -1 i 3 = -i i 4 = 1 Simplify i 27 i 32 Assignment: Page 28 Problems 1 – 34 not ÷ 3 (40 ec)