Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Section 11.2 - Solving Quadratic Equations by Completing the Square - Practice - Page 770: 3

Answer

Solution set: $\{1 + \sqrt7, 1 - \sqrt{7}\}$

Work Step by Step

1. Multiply both sides by 6, to eliminate the fractions. $(\frac{1}{6}x^2 - \frac{1}{3}x - 1 ) \times 6 =( 0 ) \times 6$ $x^2 - 2x - 6 = 0$ 2. Now, use the quadratic formula to find the values for x: $x = \frac{-(b) ± \sqrt{(b)^2 - 4(a)(c)}}{2(a)}$ $x = \frac{-(-2) ± \sqrt{(-2)^2 - 4(1)(-6)}}{2(1)}$ $x = 1 ± \frac{\sqrt{28}}{2} = 1 ± \frac{\sqrt{28}}{\sqrt{4}}= 1 \sqrt{7}$ Therefore, the solution set is: $\{1 + \sqrt7, 1 - \sqrt{7}\}$
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