Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 9 - Systems and Matrices - 9.7 Properties of Matrices - 9.7 Exercises - Page 930: 44

Answer

\[\left[ {\begin{array}{*{20}{c}} 3&{ - 6} \\ 0&{ - 9/2} \end{array}} \right]\]

Work Step by Step

\[\begin{gathered} {\text{Let }}A = \left[ {\begin{array}{*{20}{c}} { - 2}&4 \\ 0&3 \end{array}} \right] \hfill \\ {\text{Find }} - \frac{3}{2}A \hfill \\ - \frac{3}{2}A = - \frac{3}{2}\left[ {\begin{array}{*{20}{c}} { - 2}&4 \\ 0&3 \end{array}} \right] \hfill \\ {\text{Use the scalar multiplication}} \hfill \\ - \frac{3}{2}A = \left[ {\begin{array}{*{20}{c}} { - \frac{3}{2}\left( { - 2} \right)}&{ - \frac{3}{2}\left( 4 \right)} \\ { - \frac{3}{2}\left( 0 \right)}&{ - \frac{3}{2}\left( 3 \right)} \end{array}} \right] \hfill \\ - \frac{3}{2}A = \left[ {\begin{array}{*{20}{c}} 3&{ - 6} \\ 0&{ - 9/2} \end{array}} \right] \hfill \\ \end{gathered} \]
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