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 - 5.3 Factoring Trinomials of the Type ax2+bx+c - 5.3 Exercise Set - Page 326: 79

Answer

Juan incorrectly gets rid of the negative in front of 9x.

Work Step by Step

If I were grading a 10 point quiz, I would take one point off. After all, Juan just drops a negative, but since he does not drop a negative elsewhere, it appears that this is the result of a simple mistake as opposed to a lack of knowledge.
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