Linear Algebra: A Modern Introduction

Published by Cengage Learning
ISBN 10: 1285463242
ISBN 13: 978-1-28546-324-7

Chapter 3 - Matrices - 3.3 The Inverse of a Matrix - Exercises 3.3 - Page 178: 3


Not invertible.

Work Step by Step

We know that if the determinant of a matrix $\begin{bmatrix} a &b \\ c & d \end{bmatrix}$ $, D=ad-bc$ is $0$, then the matrix is not invertible. Here $D=3\cdot8-4\cdot6=24-24=0$, thus the matrix is not invertible.
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