Elementary Technical Mathematics

Published by Brooks Cole
ISBN 10: 1285199197
ISBN 13: 978-1-28519-919-1

Chapter 11 - Section 11.5 - Imaginary Numbers - Exercise - Page 378: 48

Answer

$0.25 + 0.661j, \ or, \ 0.25 - 0.661j$

Work Step by Step

For the equation $2x^2 -x+1= 0$, we use the quadratic formula as follows $$ x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}, \\ a=2, \quad b=-1, \quad c=1 .$$ That is, $$ x=\frac{1\pm \sqrt{1-8}}{2(2) }=0.25 + 0.661j, \ or, \ 0.25 - 0.661j .$$
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