Matrix Algebra for Engineers by Jeffrey Chasnov
Author:Jeffrey Chasnov
Language: eng
Format: epub
Publisher: Bookboon.com Ltd.
Published: 2018-07-03T00:00:00+00:00
22 Application of the null space
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An underdetermined system of linear equations Ax = b with more unknowns than equations may not have a unique solution. If u is the general form of a vector in the null space of A, and v is any vector that satisfies Av = b, then x = u + v satisfies Ax = A(u + v) = Au + Av = 0 + b = b. The general solution of Ax = b can therefore be written as the sum of a general vector in Null(A) and a particular vector that satisfies the underdetermined system.
As an example, suppose we want to find the general solution to the linear system of two equations and three unknowns given by
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