Answer
$-\dfrac{b}{2a}$
Work Step by Step
RECALL:
The vertex of a quadratic function has an $x$-coordinate of $-\dfrac{b}{2a}$.
Thus, the missing expression in the given statement is:
$-\dfrac{b}{2a}$.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 4 - Section 4.3 - Quadratic Functions and Their Properties - 4.3 Assess Your Understanding - Page 299: 7
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