Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 8 - Application of Trigonometry - Chapter 8 Test Prep - Review Exercises - Page 840: 43

Answer

$$\eqalign{ & \left( {\bf{a}} \right){\bf{i}} \cr & \left( {\bf{b}} \right)4{\bf{i}} - 2{\bf{j}} \cr & \left( {\bf{c}} \right)11{\bf{i}} - 7{\bf{j}} \cr} $$

Work Step by Step

$$\eqalign{ & {\text{Let }}{\bf{v}} = 2{\bf{i}} - {\bf{j}}{\text{ and }}{\bf{u}} = - 3{\bf{i}} + 2{\bf{j}} \cr & \cr & \left( {\bf{a}} \right){\text{ 2}}{\bf{v}}{\text{ + }}{\bf{u}} \cr & {\text{ 2}}{\bf{v}}{\text{ + }}{\bf{u}} = 2\left( {2{\bf{i}} - {\bf{j}}} \right) + \left( { - 3{\bf{i}} + 2{\bf{j}}} \right) \cr & {\text{Simplify}} \cr & {\text{ 2}}{\bf{v}}{\text{ + }}{\bf{u}} = 4{\bf{i}} - 2{\bf{j}} - 3{\bf{i}} + 2{\bf{j}} \cr & {\text{ 2}}{\bf{v}}{\text{ + }}{\bf{u}} = {\bf{i}} \cr & \cr & \left( {\bf{b}} \right){\text{ 2}}{\bf{v}} \cr & {\text{ 2}}{\bf{v}} = 2\left( {2{\bf{i}} - {\bf{j}}} \right) \cr & {\text{Simplify}} \cr & {\text{ 2}}{\bf{v}} = 4{\bf{i}} - 2{\bf{j}} \cr & \cr & \left( {\bf{c}} \right){\text{ }}{\bf{v}} - 3{\bf{u}} \cr & {\text{ }}{\bf{v}} - 3{\bf{u}} = \left( {2{\bf{i}} - {\bf{j}}} \right) - 3\left( { - 3{\bf{i}} + 2{\bf{j}}} \right) \cr & {\text{Simplify}} \cr & {\text{ }}{\bf{v}} - 3{\bf{u}} = 2{\bf{i}} - {\bf{j}} + 9{\bf{i}} - 6{\bf{j}} \cr & {\text{ }}{\bf{v}} - 3{\bf{u}} = 11{\bf{i}} - 7{\bf{j}} \cr} $$
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.