Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 4 - Quadratic Functions - 4.6 Solving Quadratic Equations by Using the Quadratic Formula - 4.6 Exercises - Page 373: 49

Answer

No real solution

Work Step by Step

Use the quadratic formula after bringimg the equation to the standard form. $$ \begin{aligned} \frac{2}{3} c^2-\frac{5}{6}&=\frac{1}{6} c-2\\ \left( \frac{2}{3} c^2-\frac{5}{6} \right)\cdot 6& =\left( \frac{1}{6} c-2\right) \cdot 6\\ 4c^2-5 & =c-12 \\ 4c^2-c-5+12 & = 0 \\ 4c^2-c+7 & = 0 \\ \end{aligned} $$ $$ \begin{aligned} a & =4 \\ b& =-1\\ d & =7 \\ \end{aligned} $$ $$ \begin{aligned} c&= \frac{-b\pm \sqrt{b^2-4ad}}{2a}\\ c& =\frac{-(-1) \pm \sqrt{(-1)^2-4 \cdot 4 \cdot 7}}{2 \cdot 4}\\ & =\frac{1\pm\sqrt{-111}}{8}. \end{aligned} $$ The equation has no real solution because we cannot take the square root of a negative number.
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