In Exercises 19–22, determine by inspection whether the ma- trix is invertible. 19. 0 6 0 7 0 0 -4 -2 20. 2 3 005 · 1 0 0

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter3: Matrices
Section3.2: Matrix Algebra
Problem 21EQ: Prove the half of Theorem 3.3 (e) that was not proved in the text.
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In Exercises 19-22, determine by inspection whether the ma-
trix is invertible.
19.
21.
0
0
0
6
1
7 -4
0-2
1
0
2 -5
4 -3
1
-2
0
0
0 0
4 0
1 3
20.
22.
1
0
0
24
3
0
0
5
2000
-3 −1
0 0
-4 -6
00
038 - 5
Transcribed Image Text:In Exercises 19-22, determine by inspection whether the ma- trix is invertible. 19. 21. 0 0 0 6 1 7 -4 0-2 1 0 2 -5 4 -3 1 -2 0 0 0 0 4 0 1 3 20. 22. 1 0 0 24 3 0 0 5 2000 -3 −1 0 0 -4 -6 00 038 - 5
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