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 - Page A 64: 3

Answer

$13+18i$

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: $13+18i$.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.