Find a spanning set for im(A). Find a spanning set for null(A).

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.5: The Kernel And Range Of A Linear Transformation
Problem 10EQ
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[Subspaces and Spanning Sets] How to solve?

Theorem 1
Let A be a m x n matrix.
1. The set null(A) = {x € R" | Ax = 0} is a subspace of R". We call this subspace the
null space of A.
2. The set im(A) = {b € R™ | Ax= b for some xe R"} is a subspace of R". We call this subspace
the image of A.
Transcribed Image Text:Theorem 1 Let A be a m x n matrix. 1. The set null(A) = {x € R" | Ax = 0} is a subspace of R". We call this subspace the null space of A. 2. The set im(A) = {b € R™ | Ax= b for some xe R"} is a subspace of R". We call this subspace the image of A.
1
1 3
1
0 -1
Let A =
2
1
1
It has RREF given by R=
1
-1
1
7
0 0 0
1. Find a spanning set for im(A).
2. Find a spanning set for null(A).
Transcribed Image Text:1 1 3 1 0 -1 Let A = 2 1 1 It has RREF given by R= 1 -1 1 7 0 0 0 1. Find a spanning set for im(A). 2. Find a spanning set for null(A).
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