5.4 imaginary and complex numbers -...

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Algebra 2 Trig Name__________________________________

5.4 Imaginary and Complex Numbers

I. Imaginary Numbers

Let i =

So 2i =

3i =

4i =

5i =

II. Complex Numbers: Real vs. Imaginary

III. Operations & Simplifying with Complex Numbers

a. Addition & Subtraction

1. (8+4i) + (2 – 6i) = 2. (7+3i) – (5+8i) =

b. Multiplication

1. (2 – 3i)(4 + 5i) = 2. (5i)(3i)(-4i) =

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