Outlines the general formula for finding the determinant of a 2x2, then goes through one simple example. Note at the end regarding the fact that if the determinant equals zero then that matrix has no inverse.

Finding the determinant of a 2x2 matrix (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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Finding the determinant of a 2x2 matrix (MathsCasts)

Finding the determinant of a 2x2 matrix (MathsCasts)