(a) whether row interchanges are necessary. Solve the following linear system Ax = b by Gaussian elimination if possible, and determine 1 1 1 2 1 -1 1 A = x = (x1,x2, X3, X4)", b= (2,1,4, –3)". -1 2 3 -1 -1 -1 2

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter2: Systems Of Linear Equations
Section2.2: Direct Methods For Solving Linear Systems
Problem 60EQ
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Part A

all computations, you could give your answers to five decimal places if needed

Question 6
(a)
whether row interchanges are necessary.
Solve the following linear system Ax = b by Gaussian elimination if possible, and determine
1
1
1
2
1
-1
1
A =
x = (x1, x2, x3, x4)", b= (2,1,4, –3)".
-1
2
3
-1
-1
-1
(b)
triangular with 1's on its diagonal, and U is upper triangular.
Use the results in (a) to obtain an LU factorization of the matrix A, such that L is lower
Page 8
Transcribed Image Text:Question 6 (a) whether row interchanges are necessary. Solve the following linear system Ax = b by Gaussian elimination if possible, and determine 1 1 1 2 1 -1 1 A = x = (x1, x2, x3, x4)", b= (2,1,4, –3)". -1 2 3 -1 -1 -1 (b) triangular with 1's on its diagonal, and U is upper triangular. Use the results in (a) to obtain an LU factorization of the matrix A, such that L is lower Page 8
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