Answer
$a>0$
Work Step by Step
Given $$\begin{aligned}
f(x) &= a(x-h)^2+ k.
\end{aligned}$$ The constant, $a$, will cause the graph of a parabola to face upward and must be positive.
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: 7
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