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: 5

Answer

Please see the graph. $x=36.88, -4.88$
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Work Step by Step

$.25x^2-8x-45=0$ $x=(-b±\sqrt {b^2-4ac})/2a$ $x=(-(-8)±\sqrt {(-8)^2-4*1/4*(-45)})/2*.25$ $x=(8±\sqrt {64+45})/.5$ $x=(8±\sqrt {109})/.5$ $x=2*(8±\sqrt {109})/2*.5$ $x=2*(8±\sqrt {109})$ $x=2*(8±10.44)$ $x=2*(8+10.44)$ $x=2*(18.44)$ $x=36.88$ $x=2*(8-10.44)$ $x=2*(-2.44)$ $x=-4.88$
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