21. Let Ax = 0 be a homogeneous system of n linear equations in n unknowns that has only the trivial solution. Prove that if k is any positive integer, then the system Akx = 0 also has only the trivial solution.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter4: Eigenvalues And Eigenvectors
Section4.6: Applications And The Perron-frobenius Theorem
Problem 23EQ
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Ff1.6 question 21 on paper please
In Exercises 19-20, solve the matrix equation for X.
T1
[1
-1
1
2
5
7
8
19.
2
3
0X=
[
4
0
0
1
0
2
5
2
1
-2
3 2 1
20.
0 -1 -1 X =
7 8 9
1
1
3 79
Working with Proofs
21. Let Ax = 0 be a homogeneous system of n linear equations in
n unknowns that has only the trivial solution. Prove that if k
is any positive integer, then the system Akx = 0 also has only
the trivial solution.
22. Let Ax = 0 be a homogeneous system of n linear equations
in n unknowns, and let Q be an invertible nxn matrix.
Prove that Ax = 0 has only the trivial solution if and only if
(QA)x= 0 has only the trivial solution.
23. Let Ax = b be any consistent system of linear equations, and
let x₁ be a fixed solution. Prove that every solution to the sys-
4
6
1
Transcribed Image Text:In Exercises 19-20, solve the matrix equation for X. T1 [1 -1 1 2 5 7 8 19. 2 3 0X= [ 4 0 0 1 0 2 5 2 1 -2 3 2 1 20. 0 -1 -1 X = 7 8 9 1 1 3 79 Working with Proofs 21. Let Ax = 0 be a homogeneous system of n linear equations in n unknowns that has only the trivial solution. Prove that if k is any positive integer, then the system Akx = 0 also has only the trivial solution. 22. Let Ax = 0 be a homogeneous system of n linear equations in n unknowns, and let Q be an invertible nxn matrix. Prove that Ax = 0 has only the trivial solution if and only if (QA)x= 0 has only the trivial solution. 23. Let Ax = b be any consistent system of linear equations, and let x₁ be a fixed solution. Prove that every solution to the sys- 4 6 1
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