# Get matrix A from a series of elementary matrices

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1. Aug 2, 2015

### Tom Salazar

1. Get A from its inverse

3. I believe it has something to do with the theorem that states: E1E2E3........EkA=I

2. Aug 2, 2015

### fzero

There's an identity that says that $(MN)^{-1} = N^{-1} M^{-1}$ that would be useful here. You should also consult your text about how to determine the inverse of an individual matrix. They probably discuss the method that uses the matrix of cofactors.

3. Aug 2, 2015

### Tom Salazar

Thank you very much!