13. Let A be an invertible n x n matrix. Let E₁, . . . ‚Ek be elementary matrices such that E... E₁A is in echelon form. Show that Ek ・・・・・ E₁ • E₁ = A-¹.

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Chapter7: Eigenvalues And Eigenvectors
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13. Let A be an invertible n x n matrix. Let E₁, . . . ‚Ek be elementary matrices
such that E... E₁A is in echelon form. Show that Ek • E₁ = A-¹.
14. Use the matrix version of the Gauss-Jordan procedure developed in Exercise
13 to find A-¹ for the following matrices A:
001
2
a)
3)
b)
0 1 0
3
101
- 1
2
1
a b
c)
1
2
1
d)
01
ca, b, c ER
3
-1 0
001
Transcribed Image Text:13. Let A be an invertible n x n matrix. Let E₁, . . . ‚Ek be elementary matrices such that E... E₁A is in echelon form. Show that Ek • E₁ = A-¹. 14. Use the matrix version of the Gauss-Jordan procedure developed in Exercise 13 to find A-¹ for the following matrices A: 001 2 a) 3) b) 0 1 0 3 101 - 1 2 1 a b c) 1 2 1 d) 01 ca, b, c ER 3 -1 0 001
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