Answer
-15
Work Step by Step
We find the determinant of the matrix:
$\begin{vmatrix}
-6 & 9 \\
1 & 1
\end{vmatrix}$
$=-6*1-9*1$
$=-6-9$
$=-15$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.4 The Cross Product - Exercises - Page 676: 3
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