Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 11 - Quadratic Functions and Equations - 11.2 The Quadratic Formula - 11.2 Exercise Set - Page 713: 39



Work Step by Step

Solving by plugging in the given value and then using the quadratic formula, we find: $$ 6x^2-7x-20=0\\ x_{1,\:2}=\frac{-\left(-7\right)\pm \sqrt{\left(-7\right)^2-4\cdot \:6\left(-20\right)}}{2\cdot \:6}\\ x=\frac{5}{2},\:x=-\frac{4}{3}$$
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