College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 6 - Matrices and Determinants - Exercise Set 6.4 - Page 639: 23

Answer

$\begin{bmatrix}1&0&0&|&1&0&1\\0&1&0&|&1&1&2\\0&0&1&|&3&2&6\end{bmatrix}$

Work Step by Step

We are given the matrix: $A=\begin{bmatrix}2&2&-1\\0&3&-1\\-1&-2&1\end{bmatrix}$ We start with the matrix: $\begin{bmatrix}2&2&-1&|&1&0&0\\0&3&-1&|&0&1&0\\-1&-2&1&|&0&0&1\end{bmatrix}$ Add $R_3$ to $R_1$: $\begin{bmatrix}1&0&0&|&1&0&1\\0&3&-1&|&0&1&0\\-1&-2&1&|&0&0&1\end{bmatrix}$ Add $R_1$ to $R_3$: $\begin{bmatrix}1&0&0&|&1&0&1\\0&3&-1&|&0&1&0\\0&-2&1&|&1&0&2\end{bmatrix}$ Add $R_3$ to $R_2$: $\begin{bmatrix}1&0&0&|&1&0&1\\0&1&0&|&1&1&2\\0&-2&1&|&1&0&2\end{bmatrix}$ Add $2R_2$ to $R_3$: $\begin{bmatrix}1&0&0&|&1&0&1\\0&1&0&|&1&1&2\\0&0&1&|&3&2&6\end{bmatrix}$
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