Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

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



Work Step by Step

Recall: $\begin{vmatrix} a&b\\ c&d\\ \end{vmatrix}= ad - bc$ Thus, $\begin{vmatrix} 3&4\\ 1&2\\ \end{vmatrix}= (3\times2)-(4\times1)= 6-4= 2$
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