Through an examples shows how to multiply complex numbers introducing the powers if i such as i^2.

Multiplication of complex numbers in cartesian form (MathsCasts)

These MathsCasts were produced by the mathematics support centres at Swinburne University, the University of Limerick and Loughborough University. They were part of a collaborative research project to develop high quality resources and investigate the effectiveness of MathsCasts to support mathematics learning. The full set of resources are available at http://commons.swin.edu.au/s/mathscasts MathsCasts are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License

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Multiplication of complex numbers in cartesian form (MathsCasts)

Multiplication of complex numbers in cartesian form (MathsCasts)