## Precalculus (10th Edition)

Published by Pearson

# Chapter 9 - Polar Coordinates; Vectors - 9.7 The Cross Product - 9.7 Assess Your Understanding - Page 631: 7

#### Answer

$2$

#### Work Step by Step

RECALL: $\begin{vmatrix} a & b \\ c & d \end{vmatrix}=ad-bc$ by definition. Use the definition to obtain: $\begin{vmatrix} 3 & 4 \\ 1 & 2 \end{vmatrix}=3\cdot2-4\cdot1=6-4=2$

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