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

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

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 $x=-0.9$