6. Prove or give a counterexample. Assume all the matrices are n x n. a. If AB = CB and B # 0, then A = C. b. If A? = A, then A = O or A = 1. с. (А + B)(А — в) — А? — В?. d. If AB = CB and B is nonsingular, then A = C. e. If AB = BC and B is nonsingular, then A = C. %3D

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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linear algebra question, only sub question c, d, e

 

Ch2.1 Q 6

b. If A and B are m x n matrices and Ax
Bx for all x e R", show that A = B.
6. Prove or give a counterexample. Assume all the matrices are n x n.
а. If AB
- CB and B + O, then A = C.
b. If A? = A, then A = O or A = I.
90
Chapter 2 Matrix Algebra
с. (А + B)(А — В) — А? — В2.
CB and B is nonsingular, then A = C.
e. If AB = BC and B is nonsingular, then A = C.
d. If AB
Transcribed Image Text:b. If A and B are m x n matrices and Ax Bx for all x e R", show that A = B. 6. Prove or give a counterexample. Assume all the matrices are n x n. а. If AB - CB and B + O, then A = C. b. If A? = A, then A = O or A = I. 90 Chapter 2 Matrix Algebra с. (А + B)(А — В) — А? — В2. CB and B is nonsingular, then A = C. e. If AB = BC and B is nonsingular, then A = C. d. If AB
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