Let A be an (n × n) matrix. We apply the elementary transformation of type 1 to A: "add m times row j to row i" (i.e. row i + mx row j), where m is a non-zero constant and j < i. a) Show that this transformation is encoded as a matrix multiplication L · A where L has the following form: 1 1 m 1 1 where m is in the entry (i, j). b) Write down a closed form for the matrix L-'. Multiplying with L-1 from the left also corresponds to an elementary transformation of type 1, what is this transformation?

Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
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Chapter3: Determinants
Section3.3: Properties Of Determinants
Problem 63E: Let A be an nn matrix in which the entries of each row sum to zero. Find |A|.
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Let A be an (n × n) matrix. We apply the elementary transformation of type 1 to A:
"add m times row j to row i" (i.e. row i + mx row j), where m is a non-zero constant
and j<i.
a) Show that this transformation is encoded as a matrix multiplication L- A where
L has the following form:
1
1
т
1
where m is in the entry (i, j).
b) Write down a closed form for the matrix L-1. Multiplying with L-1 from the
left also corresponds to an elementary transformation of type 1, what is this
transformation?
Transcribed Image Text:Let A be an (n × n) matrix. We apply the elementary transformation of type 1 to A: "add m times row j to row i" (i.e. row i + mx row j), where m is a non-zero constant and j<i. a) Show that this transformation is encoded as a matrix multiplication L- A where L has the following form: 1 1 т 1 where m is in the entry (i, j). b) Write down a closed form for the matrix L-1. Multiplying with L-1 from the left also corresponds to an elementary transformation of type 1, what is this transformation?
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