Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 8 - Section 8.1 - Solving Quadratic Equations by Completing the Square - Exercise Set - Page 485: 48

Answer

$x=\dfrac{1\pm\sqrt{3}}{2}$

Work Step by Step

Using the properties of equality, the given equation, $ 6x^2-3=6x ,$ is equivalent to \begin{array}{l}\require{cancel} 6x^2-6x-3=0 \\\\ 2x^2-2x-1=0 .\end{array} Using completing the square, the solutions to the equation, $ 2x^2-2x-1=0 ,$ are \begin{array}{l}\require{cancel} x^2-x-\dfrac{1}{2}=0 \\\\ x^2-x=\dfrac{1}{2} \\\\ x^2-x+\left( \dfrac{-1}{2} \right)^2=\dfrac{1}{2}+\left( \dfrac{-1}{2} \right)^2 \\\\ x^2-x+\dfrac{1}{4}=\dfrac{1}{2}+\dfrac{1}{4} \\\\ x^2-x+\dfrac{1}{4}=\dfrac{3}{4} \\\\ \left( x-\dfrac{1}{2} \right)^2=\dfrac{3}{4} \\\\ x-\dfrac{1}{2}=\pm\sqrt{\dfrac{3}{4}} \\\\ x-\dfrac{1}{2}=\pm\dfrac{\sqrt{3}}{2} \\\\ x=\dfrac{1\pm\sqrt{3}}{2} .\end{array}
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