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 10 - Exponents and Radicals - 10.8 The Complex Numbers - 10.8 Exercise Set: 22

Answer

$4-2i\sqrt{15}$

Work Step by Step

Using $i=\sqrt{-1}$ and the properties of radicals, the given expression, $ 4-\sqrt{-60} ,$ is equivalent to \begin{array}{l}\require{cancel} 4-\sqrt{60}\cdot\sqrt{-1} \\\\= 4-\sqrt{4\cdot15}\cdot i \\\\= 4-\sqrt{(2)^2\cdot15}\cdot i \\\\= 4-2i\sqrt{15} .\end{array}
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