College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 3 - Polynomial and Rational Functions - Exercise Set 3.1 - Page 343: 15



Work Step by Step

Since the equation is not in standard form, use the formula $x=\frac{-b}{2a}$ to find the $x$ coordinate of the vertex. $f(x)=-x^{2}-2x+8$ $x=\frac{-(-2)}{2(-1)}=-1$ Now plug in the $x$ value in the original equation. $-(-1^{2})-2(-1)+8=9$ $(-1,9)$
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