Algebra 2 Lesson 2-4: Complex Numbers and Operations

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We cover the idea of complex and imaginary numbers and how they relate to other number systems. We cover operations of sum/difference and product of complex numbers. We solve quadratic equations using square root method and the use of complex numbers.

Note: There is a mistake in 17:14. It should say 9 - 4(-1) = 9 + 4 = 13.
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At 17:14 the equation 9+6i-6i-4i^2 came up, and when you were simplifying it, since the 6i and -6i become zero, you receive 9+(-4)i^2. When you were simplifying the new equation, I believe that you had mistakenly simplified the equation into 9-4 instead of the negatives cancelling out for the -4 and -1 (caused by the i^2). Is it something I'm not understanding or just a small error?

vamer