Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 5 - Polynomials and Factoring - 5.1 Introduction to Factoring - 5.1 Exercise Set - Page 311: 80

Answer

Kris' way is better.

Work Step by Step

Both expressions evaluate to the same number. While Tina uses a good method, it is best to use Kris' method, for Kris simply uses the equation for the surface area of a cylinder. Thus, while you could argue for Tina's method as it uses simpler Math, Kris' method has the benefit that using the equation will always be correct no matter the situation.
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