Algebra and Trigonometry 10th Edition

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

Chapter 1 - Chapter Test - Page 156: 17


(a) $-14$ (b) $19+17i$

Work Step by Step

(a) $\sqrt {-16}-2(7+2i)=\sqrt {16(-1)}-2(7)-2(2i)=\sqrt {16}\sqrt {-1}-14-4i=4i-14-4i=-14$ (b) $(5-i)(3+4i)=5(3)+5(4i)-i(3)-i(4i)=15+20i-3i-4i^2=15+17i+4=19+17i$
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