Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - 4.6 Perform Operations with Complex Numbers - 4.6 Exercises - Skill Practice - Page 280: 25



Work Step by Step

$(-2+5i)(-1+4i)\qquad$ ...use the FOIL method. $=(-2)(-1)+(-2)(4i)+(5i)(-1)+(5i)(4i)\qquad$ ...simplify. $=2-8i-5i+20i^{2}\qquad$ ...simplify. ($i^{2}=-1$) $=2-8i-5i+-20\qquad$ ...add like terms. $=-18-13i$
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.