Linear Algebra and Its Applications (5th Edition)

Published by Pearson
ISBN 10: 032198238X
ISBN 13: 978-0-32198-238-4

Chapter 1 - Linear Equations in Linear Algebra - 1.4 Exercises - Page 40: 3

Answer

$$ \begin{bmatrix} -3 \\ 1 \\ -4 \end{bmatrix} $$

Work Step by Step

Our task is to compute this product: $$ \begin{bmatrix} 6 & 5 \\ -4 & -3 \\ 7 & 6 \end{bmatrix} \begin{bmatrix} 2 \\ -3 \end{bmatrix} $$ By the definition of matrix-vector multiplication, we simplify it to this form: $$ \begin{bmatrix} 6(2) + 5(-3) \\ -4(2) -3(-3) \\ 7(2) + 6(-3) \end{bmatrix} $$ And through basic arithmetic, the expression boils down to $$ \begin{bmatrix} -3 \\ 1 \\ -4 \end{bmatrix} $$
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