#### Answer

highest

#### Work Step by Step

If $a<0$, then $a$ is negative. When $a$ is negative the graph of the parabola opens downward which creates an upside-down U-shaped graph. Therefore the vertex is the highest point on the graph.

Published by
Pearson

ISBN 10:
0321785045

ISBN 13:
978-0-32178-504-6

highest

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