Answer
$a<0$
Work Step by Step
Givenb$$\begin{aligned}
f(x) &= a(x-h)^2+ k.
\end{aligned}$$ The constant, $a$, is responsible for opening the graph of a parabola upward or downward. It must be negative to open the graph of a parabola downward.
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 - 4.2 Graphing Quadratics in Vertex Form - 4.2 Exercises - Page 316: 2
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
