## Precalculus (6th Edition) Blitzer

Published by Pearson

# Chapter 5 - Section 5.5 - Trigonometric Equations - Exercise Set - Page 705: 147

#### Answer

$1.37, 2.30, 3.98, 4.91\ rad$

#### Work Step by Step

Step 1. Graph the function $f(x)=15cos^2x+7cos(x)-2$ as shown in the figure. Step 2. Find the x-intercepts within $[0,2\pi)$ which are the solutions: $1.37, 2.30, 3.98, 4.91\ rad$

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