Answer
$x = 5$
Work Step by Step
The determinant is:
$D = 1 \times 7 - x \times 2$
and we know that $D=-3$
Therefore
$1 \times 7 - x \times 2 = -3$
$7 - 2x = -3$
$-2x = -10$
$x = 5$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Appendix E - Exercise Set - Page 1005: 35
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