Elementary Linear Algebra 7th Edition

by Larson, Ron

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: 54

Answer

$3=x$

Work Step by Step

That would mean that $AA$ is equal to the identity matrix; thus the equations we get are: $4-x=1,2x-2x=0,-2-(-2)=0,-x+4=1$ The middle two are satisfied and the other two are the same, so $4-x=1\\3=x$

Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.