Answer
Change $a$
Work Step by Step
The graph of the parabola opens downward away from the data points. We need to flip the parabola so that it fits the data points. This can be achieved by changing the value of $a$ to a positive value.
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 4 - Quadratic Functions - 4.3 Finding Quadratic Models - 4.3 Exercises - Page 332: 16
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