Question: 3. Which three elementary matrices E21, E31, E32 put A into echelon form U? 1 10 A == 4 6 1 -22 0 and

3. Which three elementary matrices E21, E31, E32 put A into echelon form U? 1 10 A == 4 6 1 -22 0 and E32 E31 E21 A = U. Multiply those E's to get one matrix M that does elimination: MA=U.

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