Starting from a 3 by 3 matrix A with pivots 2, 7, 6, add a fourth row and column to
Chapter 1, Problem 1.5.36(choose chapter or problem)
Starting from a 3 by 3 matrix A with pivots 2, 7, 6, add a fourth row and column to produce M. What are the first three pivots for M, and why? What fourth row and column are sure to produce 9 as the fourth pivot?
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