Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - 4.8 Use the Quadratic Formula and the Discriminant - 4.8 Exercises - Skill Practice - Page 296: 27



Work Step by Step

Solving the equation using the quadratic formula, we find: $$x_{1,\:2}=\frac{-\left(-6\right)\pm \sqrt{\left(-6\right)^2-4\cdot \:3\left(-24\right)}}{2\cdot \:3} \\ x=4,\:x=-2$$ Checking by factoring the expression, we find: $$3\left(x^2-2x-8\right) \\ 3\left(x+2\right)\left(x-4\right)$$
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