Show that if a 3×3 matrix A is never sad then the entries along its diagonal, i.e. a11, a22, a33, must be non-negative.

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter7: Systems Of Equations And Inequalities
Section7.6: Solving Systems With Gaussian Elimination
Problem 5SE: Can a matrix that has 0 entries for an entire row have one solution? Explain why or why not.
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Show that if a 3×3 matrix A is never sad then the entries along its diagonal, i.e. a11, a22, a33, must be non-negative.

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