Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set: 58

Answer

$-8$

Work Step by Step

RECALL: (1) $\sqrt{-1}=i$ (2) $i^2=-1$ (3) $\sqrt{ab} = \sqrt{a} \cdot \sqrt{b}$ Simplify each radical by using rule (1) above: $=\sqrt{16(-1)} \cdot \sqrt{4(-1)} \\=\sqrt{4^2(-1)} \cdot \sqrt{2^2(-1)} \\=4\sqrt{-1} \cdot 2\sqrt{-1} \\=4i \cdot 2i \\=8i^2$ Use rule (2) above to obtain: $=8(-1) \\=-8$
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