Answer
$-8$, invertible
Work Step by Step
Using a graphing calculator (see attached picture), we get:
$D=-8$
The determinant is not $0$, so the matrix is invertible.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 6, Matrices and Determinants - Section 6.4 - Determinants and Cramer's Rule - 6.4 Exercises - Page 534: 34
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