Find the RREF of [A| I], then determine whether A is invertible and, if so, find A-1. 2 -2 1 2 3 (i) A = 1 -1 -1 -2 4 5 6 (ii) A = 2 1 7 8 9 1 3 1

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter6: Matrices And Determinants
Section6.4: Determinants And Cramer’s Rule
Problem 3E
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Find the RREF of [A| I], then determine whether A is invertible and, if so, find A-1.
SO,
1
0 -2
1 2 3
4 5 6
7 8 9
1
-1
(i) A :
(ii) A =
-1
-2
1
1 3
1
Transcribed Image Text:Find the RREF of [A| I], then determine whether A is invertible and, if so, find A-1. SO, 1 0 -2 1 2 3 4 5 6 7 8 9 1 -1 (i) A : (ii) A = -1 -2 1 1 3 1
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