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: 26



Work Step by Step

Solving the equation using the quadratic formula, we find: $$r_{1,\:2}=\frac{-\left(-9\right)\pm \sqrt{\left(-9\right)^2-4\cdot \:1\cdot \:8}}{2\cdot \:1} \\ r=8,\:r=1$$ Checking by factoring the expression, we find: $$r\left(r-1\right)-8\left(r-1\right)\\ \left(r-1\right)\left(r-8\right)$$
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