Consider the following Gauss-Jordan reduction: 1 9. 5 1 1 1 0. 1 -2 0. -2 5 1 0. = 1 1 1 1 A Ej A E2 Ej A E3 E2 Ej A E4 E, E, Ej A Find Ej = E2 = , E3 = . E4 = %3D -1 Write A as a product A = E,' E,' E,' E,' of elementary matrices: 1 9. -2 1

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