Answer
$-b/2a$
Work Step by Step
The graph of $f(x)=ax^2+bx+c$, $a\ne0$, is a parabola whose vertex has x-value $-b/2a$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 8 - Section 8.6 - Further Graphing of Quadratic Functions - Vocabulary, Readiness & Video Check - Page 525: 2
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