Answer
A negative was dropped.
Work Step by Step
The student forgot that the x-coordinate of the vertex is $-\frac{b}{2a}$. Thus, the answer should have been -3, not 3.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 - 4.1 Graph Quadratic Functions in Standard Form - 4.1 Exercises - Skill Practice - Page 240: 19
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