Answer
$$x=-\frac{5}{2}$$
Work Step by Step
Solving the equation using the quadratic formula, we obtain:
$$x_{1,\:2}=\frac{-20\pm \sqrt{20^2-4\cdot \:4\cdot \:25}}{2\cdot \:4} \\ x=-\frac{5}{2}$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - 4.4 Solve ax(squared) + bx + c = 0 by Factoring - 4.4 Exercises - Quiz for Lessons 4-1-4.4 - Page 265: 12
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