Elementary Linear Algebra 7th Edition

Published by Cengage Learning
ISBN 10: 1-13311-087-8
ISBN 13: 978-1-13311-087-3

Chapter 2 - Matrices - 2.3 The Inverse of a Matrix - 2.3 Exercises - Page 72: 55

Answer

$x=6.$

Work Step by Step

$A$ is singular if $$ad-bc=0 \Longrightarrow -12+2x=0\Longrightarrow x=6. $$
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