Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 3 - Quadratic Functions - Strengthen Your Understanding - Page 130: 15



Work Step by Step

Test this out with a few values on your graphing calculator. For example, $y=-x^2$ has an $a$ value of $-1$, which is less than zero. This parabola opens downward. Look at more examples with $a<0$ and you will see the trend.
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