Solving a quadratic by factoring

Learn more: http://www.khanacademy.org/video?v=N30tN9158Kc
factoring quadratics

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Length: 5 minutes

Introduction to i and Imaginary Numbers

Length: 6 minutes

Calculating i Raised to Arbitrary Exponents

Length: 6 minutes

i as the Principal Root of -1 (a little technical)