2
$\begingroup$

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

enter image description here

Thank you.

  • 1
    Expand the determinant by the last row.2011-06-01

1 Answers 1

2

This property:

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

  • 0
    Aka as [Laplace or cofactor expansion](http://en.wikipedia.org/wiki/Laplace_expansion).2011-06-01