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inverse of a matrix

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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Source: — Quantitative Reasoning |
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by BarryLi » Tue Feb 22, 2011 2:47 am
Let A be the 2x2 matrix:
[ a b ]
[ c d ]

The inverse of A, say B, is defined by:
B = (1 / (ad-bc)) * [d -b]
B = (1 / (ad-bc)) * [-c a] (ignore the white text)

You may see the term the determinant used: given how A was described, it is ad-bc.
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