Intermediate Algebra (6th Edition)

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

Chapter 8 - Review - Page 531: 17

Answer

$x=\dfrac{5\pm i\sqrt{143}}{12}$

Work Step by Step

Using the properties of equality, the given quadratic equation, $ 6x^2+7=5x ,$ is equivalent to \begin{array}{l}\require{cancel} 6x^2-5x+7=0 .\end{array} Using $x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$ or the Quadratic Formula, the solutions of the quadratic equation above are \begin{array}{l}\require{cancel} x=\dfrac{-(-5)\pm\sqrt{(-5)^2-4(6)(7)}}{2(6)} \\\\ x=\dfrac{5\pm\sqrt{25-168}}{12} \\\\ x=\dfrac{5\pm\sqrt{-143}}{12} \\\\ x=\dfrac{5\pm\sqrt{-1}\cdot\sqrt{143}}{12} \\\\ x=\dfrac{5\pm i\sqrt{143}}{12} .\end{array}
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