Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 2 - Review Exercises - Page 233: 29


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

Work Step by Step

$f(x)=0$ $5x^2+4x-1=0~~$ ($a=5,b=4,c=-1$): $x=\frac{-b±\sqrt {b^2-4ac}}{2a}=\frac{-4±\sqrt {4^2-4(5)(-1)}}{2(5)}=\frac{-4±\sqrt {36}}{10}=\frac{-4±6}{10}$ $x=\frac{2}{10}=\frac{1}{5}$ or $x=-1$
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