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: 25

Answer

$\begin{bmatrix}1&0&0&|&-3&2&-4\\0&1&0&|&-1&1&-1\\0&0&1&|&8&-5&10\end{bmatrix}$

Work Step by Step

We are given the matrix: $A=\begin{bmatrix}5&0&2\\2&2&1\\-3&1&-1\end{bmatrix}$ We start with the matrix: $\begin{bmatrix}5&0&2&|&1&0&0\\2&2&1&|&0&1&0\\-3&1&-1&|&0&0&1\end{bmatrix}$ Add $-2R_2$ to $R_1$: $\begin{bmatrix}1&-4&0&|&1&-2&0\\2&2&1&|&0&1&0\\-3&1&-1&|&0&0&1\end{bmatrix}$ Add $-2R_1$ to $R_2$: $\begin{bmatrix}1&-4&0&|&1&-2&0\\0&10&1&|&-2&5&0\\-3&1&-1&|&0&0&1\end{bmatrix}$ Add $3R_1$ to $R_3$: $\begin{bmatrix}1&-4&0&|&1&-2&0\\0&10&1&|&-2&5&0\\0&-11&-1&|&3&-6&1\end{bmatrix}$ Add $R_3$ to $R_2$: $\begin{bmatrix}1&-4&0&|&1&-2&0\\0&-1&0&|&1&-1&1\\0&-11&-1&|&3&-6&1\end{bmatrix}$ Multiply $R_2$ by $-1$: $\begin{bmatrix}1&-4&0&|&1&-2&0\\0&1&0&|&-1&1&-1\\0&-11&-1&|&3&-6&1\end{bmatrix}$ Multiply $4R_2$ to $R_1$: $\begin{bmatrix}1&0&0&|&-3&2&-4\\0&1&0&|&-1&1&-1\\0&-11&-1&|&3&-6&1\end{bmatrix}$ Multiply $11R_2$ to $R_3$: $\begin{bmatrix}1&0&0&|&-3&2&-4\\0&1&0&|&-1&1&-1\\0&0&-1&|&-8&5&-10\end{bmatrix}$ Multiply $R_3$ by $-1$: $\begin{bmatrix}1&0&0&|&-3&2&-4\\0&1&0&|&-1&1&-1\\0&0&1&|&8&-5&10\end{bmatrix}$
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