Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 3 - 3.1 - Quadratic Functions and Models - 3.1 Exercises - Page 250: 77



Work Step by Step

The $y$ of the vertex is $25$: $f(-\frac{b}{2a})=25$ $f(-\frac{b}{-2})=f(\frac{b}{2})=25$ $-(\frac{b}{2})^2+b(\frac{b}{2})-75=25$ $-\frac{b^2}{4}+\frac{b^2}{2}=100$ $\frac{b^2}{4}=100$ $b^2=400$ $b=±20$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.