Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 8 - Section 8.3 - Matrix Operations and Their Applications - Exercise Set - Page 917: 13

Answer

a. $\begin{bmatrix} -3 \\ -1 \\ 0 \end{bmatrix}$ b. $ \begin{bmatrix} 7 \\ -7 \\ 2 \end{bmatrix}$ c. $ \begin{bmatrix} -8 \\ 16 \\ -4 \end{bmatrix}$ d. $\begin{bmatrix} -4 \\ -6 \\ 1 \end{bmatrix}$

Work Step by Step

Given $A=\begin{bmatrix} 2 \\ -4 \\ 1 \end{bmatrix}$ and $B=\begin{bmatrix} -5 \\ 3 \\ -1 \end{bmatrix}$, we have: a. $A+B=\begin{bmatrix} 2 \\ -4 \\ 1 \end{bmatrix}+\begin{bmatrix} -5 \\ 3 \\ -1 \end{bmatrix}=\begin{bmatrix} -3 \\ -1 \\ 0 \end{bmatrix}$ b. $A-B=\begin{bmatrix} 2 \\ -4 \\ 1 \end{bmatrix}-\begin{bmatrix} -5 \\ 3 \\ -1 \end{bmatrix}=\begin{bmatrix} 7 \\ -7 \\ 2 \end{bmatrix}$ c. $-4A=\begin{bmatrix} -8 \\ 16 \\ -4 \end{bmatrix}$ d. $3A+2B=\begin{bmatrix} 6 \\ -12 \\ 3 \end{bmatrix}+\begin{bmatrix} -10 \\ 6 \\ -2 \end{bmatrix}=\begin{bmatrix} -4 \\ -6 \\ 1 \end{bmatrix}$
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