Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 2 - Matrices and Systems of Linear Equations - 2.5 Gaussian Elimination - Problems - Page 168: 52

Answer

The solution is $(r-5ir+5t+ti,13r,13t)$

Work Step by Step

$Ax=0 $ $\begin{bmatrix} 2-3i& 1+i&i-1\\ 3+2i & -1+i & -1-i\\ 5-i &2i &-2 \end{bmatrix}.\begin{bmatrix} x_1\\ x_2\\ x_3 \end{bmatrix}=\begin{bmatrix} 0\\ 0\\ 0 \end{bmatrix} $ $\begin{bmatrix} 2-3i& 1+i&i-1|0\\ 3+2i & -1+i & -1-i|0\\ 5-i &2i &-2 |0 \end{bmatrix} \approx^1\begin{bmatrix} 1&\frac{-1+5i}{13}&\frac{-5-i}{13}|0\\ 3+2i & -1+i & -1-i|0\\ 5-i &2i &-2 |0 \end{bmatrix} \approx^2\begin{bmatrix} 1&\frac{-1+5i}{13}&\frac{-5-i}{13}|0\\ 0& 0 & 0|0\\ 0&0 &0 |0 \end{bmatrix} $ This matrix is now in row-echelon form. $1. M_1(\frac{2+3i}{13})$ $2. A_{2}(-3-2i),A_{13}(-5+i)$ The solution set is: $x_1+\frac{-1+5i}{13}x_2+\frac{-5-i}{13}x_3=0$ $x_2=13r$ $x_3=13t$ There is one free variable, which we take to be $x_2=13r,x_3=13t$, where r ans t can assume any complex value. Applying back substitution yields: $x_1+\frac{-1+5i}{13}.13r+\frac{-5-i}{13}.13t=0 \rightarrow x_1=r-5ir+5t+ti$ $x_2=13r$ $x_3=13t$ Hence, the solution is $(r-5ir+5t+ti,13r,13t)$
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