Answer
$1/8$
Work Step by Step
The determinant of a two by two matrix is $ad-bc$
$1/2*1/2-1/8= 1/8$
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 533: 13
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