Answer
$-\frac{b}{2a}$
Work Step by Step
The x coordinate of the vertex of the parabola $ax^2+bx+c=0$, $a\ne0$ is $-\frac{b}{2a}$.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 3 - Linear and Quadratic Functions - 3.3 Quadratic Functions and Their Properties - 3.3 Assess Your Understanding - Page 145: 7
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