Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

APPENDIX H - Complex Numbers - H Exercises: 3



Work Step by Step

Start with the given expression: $(2+5i)(4-i)$. Distribute binomials: $8+20i-2i-5i^{2}$. Substitute $i^{2}=-1$ into the expression: $8+20i-2i+5$. Combine real and imaginary terms to arrive at the answer: $13+18i$.
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