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Could someone please explain to me what property was used in simplifying this, or how this was achieved?

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Thank you.

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Expand the determinant by the last row. –  Davide Giraudo Jun 1 '11 at 22:23
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1 Answer 1

up vote 3 down vote accepted

This property:

http://mathworld.wolfram.com/DeterminantExpansionbyMinors.html

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hehe I love this place. Thanks. –  Virtuoso Jun 1 '11 at 22:26
    
Aka as Laplace or cofactor expansion. –  lhf Jun 1 '11 at 22:27
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