(a) Consider the matrix -2 1 1 -2 41 2 1 A = -1 257 Find a basis for the null space of A. What is the dimension of the null space?

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter5: Orthogonality
Section5.4: Orthogonal Diagonalization Of Symmetric Matrices
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(a) Consider the matrix
1
-2 1 1
A =
-2 4
1 2
-1 2 5 7
Find a basis for the null space of A. What is the dimension of the mull space?
(b) Consider another 3 x 4 matrix B whose null space has a basis {[1,3, 2,0". [1,0, -1, 1]"). Let b,
be the i-th column of B. If c = -bı + b3 + 3ba, find all solutions of the system Bx = c.
Transcribed Image Text:(a) Consider the matrix 1 -2 1 1 A = -2 4 1 2 -1 2 5 7 Find a basis for the null space of A. What is the dimension of the mull space? (b) Consider another 3 x 4 matrix B whose null space has a basis {[1,3, 2,0". [1,0, -1, 1]"). Let b, be the i-th column of B. If c = -bı + b3 + 3ba, find all solutions of the system Bx = c.
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