Answer
$x=-7.6,21.6$
Work Step by Step
When taking the square root of a number, you get a positive and a negative answer.
$3(x-7)^2+8=647.48$
$3(x-7)^2=639.48$
$(x-7)^2=213.16$
$x-7=14.6$
$x=21.6$
or
$x-7=-14.6$
$x=-7.6$.
So
$x=-7.6,21.6$.
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 4 - Quadratic Functions - 4.4 Solving Quadratic Equations by the Square Root Property and Completing the Square - 4.4 Exercises - Page 346: 11
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter 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.
