Suppose that AB C, where A is 3x4 and C' is 3x2. Then B must be To find the entry c21 of C = AB, you can take the dot product of of A with column of B. row Suppose that [0 2 0]B = [6 8 B must be - 2. Then the second row of [C

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 3CEXP
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Part I
Suppose that AB
C, where A is 3x4 and C is 3x2. Then B must
be
To find the entry c21 of C =
AB, you can take the dot product of
row
of A with column
of B.
Suppose that [0 2
0]B = [6 8 -2]. Then the second row of
B must be
1 0 0 1 0 0
0 1 0 0 1 0
0 0 10 0 1
Let D =
Find D by treating D as a block
1 00 1 0 0
0 1 0 0 1 0
0 0 1 0 0 1
I I
D²
I I
matrix
000
Transcribed Image Text:Part I Suppose that AB C, where A is 3x4 and C is 3x2. Then B must be To find the entry c21 of C = AB, you can take the dot product of row of A with column of B. Suppose that [0 2 0]B = [6 8 -2]. Then the second row of B must be 1 0 0 1 0 0 0 1 0 0 1 0 0 0 10 0 1 Let D = Find D by treating D as a block 1 00 1 0 0 0 1 0 0 1 0 0 0 1 0 0 1 I I D² I I matrix 000
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