Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.11 Complex Numbers - A.11 Assess Your Understanding - Page A94: 10

Answer

$-4+7i$

Work Step by Step

By removing the parentheses and combine the like terms, we have By removing the parentheses and combining the like terms, we obtain \begin{align*} (4 + 5i) + ( - 8 + 2i)&=4+5i-8+2i\\ &=(4-8)+(5i+2i)\\ &=-4+7i \end{align*}
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