Answer
-3
Work Step by Step
We can expand by minors using $a_{11}, a_{21}, a_{31}$
That will give us
$$1*1-1*-1*-4+0=-3$$
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 - Chapter 6 Test - Page 541: 16
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