Chapter 9 - Quadratic Functions and Equations - 9-6 The Quadratic Formula and the Discriminant - Lesson Check - Page 571: 2

$x= 1.22, -.94$

$7x^2-2x=8$ $7x^2-2x-8=8-8$ $7x^2-2x-8=0$ $x = (-b)±\sqrt {(b^2-4*a*c})/2*a$ $x = (-(-2)±\sqrt {(-2)^2-4*7*-8})/2*7$ $x = (2±\sqrt {4+224})/14$ $x = (2±\sqrt {228})/14$ $x = (2+15.099)/14$ or $x = (2-15.099)/14$ $x = (2+15.099)/14$ $x = 17.099/14 = 1.22$ $x = (2-15.099)/14$ $x = -13.099/14 = -.94$