Answer
$-\frac{b}{2a}$
Work Step by Step
The vertex of a parabola is located on the line of symmetry. The equation of the line of symmetry is $x=-\frac{b}{2a}$. Therefore the x-value of the vertex must also be located at $-\frac{b}{2a}$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 8 - Vocabulary Check - Page 528: 3
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