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 - 2.4 Row-Echelon Matrices and Elementary Row Operations - Problems - Page 156: 17

Answer

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Work Step by Step

$\begin{bmatrix} 2 & 1 & 3 & 4 & 2\\ 1 & 0 & 2 & 1 & 3\\ 2 & 3 & 1 & 5 & 7 \end{bmatrix} \approx^1 \begin{bmatrix} 1 & 0 & 2 & 1 & 3\\ 2 & 1 & 3 & 4 & 2\\ 2 & 3 & 1 & 5 & 7 \end{bmatrix} \approx^2 \begin{bmatrix} 1 & 0 & 2 & 1 & 3\\ 0 & 1 & -1 & 2 & -4\\ 0 & 3 & -3 & 3 & 1 \end{bmatrix} \approx^3\begin{bmatrix} 1 & 0 & 2 & 1 & 3\\ 0 & 1 & -1 & 2 & -4\\ 0 & 0 & 0 & -3 & 13 \end{bmatrix} \approx^4 \begin{bmatrix} 1 & 0 & 2 & 1 & 3\\ 0 & 1 & -1 & 2 & -4\\ 0 & 0 & 0 & 1 & \frac{-13}{3} \end{bmatrix}$ Rank (A)= 3 $P_{12}$ $A_{12}(-2), A_{13}(-2)$ $A_{23}(-3)$ $M_2(-\frac{1}{3})$
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