Question

A= 2 -3 1 2 0 -1 1 4 5 Find the inverse of A using...

A=

2 -3 1
2 0 -1
1 4 5

Find the inverse of A using the method: [A | I ] → [ I | A-1 ]. Set up and then use a calculator (recommended). Express the elements of A-1 as fractions if they are not already integers. (Use Math -> Frac if needed.) (8 points)

Begin the LU factorization of A by determining a first elementary matrix E1 and its inverse E1-1. Identify the associated row operation. (That is all. You do not need to complete the LU factorization for the exam.) (4 points)

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