Intermediate Algebra: Connecting Concepts through Application

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



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 $x=-7.6,21.6$.
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