Answer
$2$
Work Step by Step
Recall:
$\begin{vmatrix}
a&b\\
c&d\\
\end{vmatrix}= ad - bc$
Thus,
$\begin{vmatrix}
3&4\\
1&2\\
\end{vmatrix}= (3\times2)-(4\times1)= 6-4= 2$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 8 - Polar Coordinates; Vectors - Section 8.7 The Cross Product - 8.7 Assess Your Understanding - Page 651: 7
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