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 8.6 Vectors in Space - 8.6 Assess Your Understanding - Page 646: 39

Answer

$-j-2k$

Work Step by Step

Let us consider two vectors $v=pi+qj+rz$ and $w=xi+yj+zk$. Then, we can write their sum as: $v+w=(p+x)i+(q+y)j+(r+z)k$ The magnitude of any vector (let us say $v$) can be determined using the formula $||v||=\sqrt{p^2+q^2+r^2} $ Therefore, $2v+3w=2 (3i-5j+2k)+3(-2i+3j-2k) \\ =6i-10j+4k-6i+9j-6k\\ =-j-2k$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.