Answer
$-b/2a$
Work Step by Step
The vertex of a parabola (where $a \ne 0$) is on the axis of symmetry. The axis of symmetry is at $x=-b/2a$. The vertex is on the axis of symmetry, so the $x$-value of the vertex is $-b/2a$.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 11 - Vocabulary Check - Page 825: 3
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