Answer
$2$
Work Step by Step
RECALL:
$\begin{vmatrix} a & b \\ c & d \end{vmatrix}=ad-bc$ by definition.
Use the definition to obtain:
$\begin{vmatrix} 3 & 4 \\ 1 & 2 \end{vmatrix}=3\cdot2-4\cdot1=6-4=2$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 9 - Polar Coordinates; Vectors - 9.7 The Cross Product - 9.7 Assess Your Understanding - Page 631: 7
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