Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - 4.7 Complete the Square - 4.7 Exercises - Skill Practice - Page 289: 40

Answer

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Work Step by Step

Given: $ y = 0.0085x^2 - 1.5x + 120$ $y=0.0085(x^2-176.47x)+120$ $y=0.0085(x^2-2\times x\times88.235+7785.415)-66.176+120$ $y=0.0085(x-88.235)^2+53.824$ $y-53.824=0.0085(x-88.235)^2$ The vertex $(88.235,53.824)$ indicates the most efficient walking speed.
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