Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 11 - Quadratic Functions and Equations - 11.2 The Quadratic Formula - 11.2 Exercise Set - Page 713: 7


$x=1$ or $x=-\displaystyle \frac{5}{2}$

Work Step by Step

$ 2x^{2}+3x-5=0\qquad$... solve with the Quadractic formula. $a=2,\ b=3,\ c=-5$ $ x=\displaystyle \frac{-b\pm\sqrt{b^{2}-4ac}}{2a}\qquad$... substitute $b$ for $3,\ a$ for $2$ and $c$ for $-5$. $ x=\displaystyle \frac{-3\pm\sqrt{(3)^{2}-4\cdot(-5)\cdot 2}}{2\cdot 2}\qquad$... simplify. $x=\displaystyle \frac{-3\pm\sqrt{9+40}}{2}$ $x=\displaystyle \frac{-3\pm\sqrt{49}}{4}$ $ x=\displaystyle \frac{-3\pm 7}{4}\qquad$... the symbol $\pm$ indicates two solutions. $x=\displaystyle \frac{-3+7}{4}$ or $x=\displaystyle \frac{-3-7}{4}$ $x=1$ or $x=-\displaystyle \frac{5}{2}$
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