Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter 7 - Section 7.7 - Complex Numbers - 7.7 Exercises: 28


$\sqrt 4$

Work Step by Step

$\frac{\sqrt -40}{\sqrt -10}=\frac{i\sqrt 40}{i\sqrt 10}=\frac{i}{i}\times\frac{\sqrt 40}{\sqrt 10}=1\times\sqrt\frac{40}{10}=\sqrt\frac{40}{10}=\sqrt 4$ We know that $\sqrt -1=i$, because $i^{2}=-1$.
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