Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 9 - Quadratic Functions and Equations - 9-6 The Quadratic Formula and the Discriminant - Lesson Check - Page 586: 2


$x=1.2$ or $x=-0.9$

Work Step by Step

We are given: $7x^2-2x=8$ $7x^2-2x-8=0$ Use the quadratic formula. $x=\frac{-(-2) \pm \sqrt (-2)^2-4.7(-8)}{2.(7)}$ $x=\frac{2 \pm 15.1}{14}$ Simplify: $x=\frac{2 +15.1}{14}$ or $x=\frac{2 - 15.1}{14}$ $x=1.2$ or $x=-0.9$
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