## Calculus: Early Transcendentals 8th Edition

$9$
Volume of a parallelepiped is defined as: $V=|a \cdot (b \times c)|$ $b \times c= \lt -1,1,2 \gt \times \lt 2,1,4 \gt=\lt 2,8,-3 \gt$ $|a \cdot (b \times c)|= |\lt 1,2,3 \gt \cdot \lt 2,8,-3 \gt |$ $=|1 \cdot2+2 \cdot 8+ 3 \cdot (-3)|$ $=|2+16+(-9)|$ $=9$