Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 7 - 7.1 - Using Fundamental Identities - 7.1 Exercises - Page 513: 30



Work Step by Step

$6~cos^2x+5~cos~x-6=6~cos^2x+9~cos~x-4~cos~x-6=$ $3~cos~x~(2~cos~x+3)-2~(2~cos~x+3)=(3~cos~x-2)(2~cos~x+3)$
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