(Solved):
Consider the following Gauss-Jordan reduction: A1304121070 ...
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Consider the following Gauss-Jordan reduction: A?1?30?4?121?070?????E1?A?100?401?070?????E2?E1?A?100?401?010?????E3?E2?E1?A?100?001?010?????E4?E3?E2?E1?A?100?010?001????=I Find Write A as a product A=E1?1?E2?1?E3?1?E4?1? of elementary matrices: