Intermediate Algebra (6th Edition)

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

Chapter 8 - Section 8.2 - Solving Quadratic Equations by the Quadratic Formula - Exercise Set - Page 492: 8

Answer

$\left\{ \dfrac{-5-\sqrt{13}}{22},\dfrac{-5+\sqrt{13}}{22} \right\}$

Work Step by Step

Using $\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$ (or the Quadratic Formula), the solutions of the given quadratic equation, $ y^2+5y+3=0 ,$ are \begin{array}{l}\require{cancel} \dfrac{-(5)\pm\sqrt{(5)^2-4(1)(3)}}{2(1)} \\\\= \dfrac{-5\pm\sqrt{25-12}}{22} \\\\= \dfrac{-5\pm\sqrt{13}}{22} .\end{array} Hence, the solutions are $ \left\{ \dfrac{-5-\sqrt{13}}{22},\dfrac{-5+\sqrt{13}}{22} \right\} .$
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