Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 9 - Quadratic Functions and Equations - Concept Byte - Finding Roots - Page 554: 4

Answer

Please see the graph. $x=17.72, .28$
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Work Step by Step

$x^2-18x+5=0$ $x=(-b±\sqrt {b^2-4ac})/2a$ $x=(-(-18)±\sqrt {(-18)^2-4*1*5})/2*1$ $x=(18±\sqrt {324-20})/2$ $x=(18±\sqrt {304})/2$ $x=(18±2\sqrt {76})/2$ $x=(9±\sqrt {76})$ $x=(9±8.72)$ $x=(9+8.72)$ $x=17.72$ $x=(9-8.72)$ $x=.28$
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