College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter 1 - Section 1.3 - Complex Numbers - 1.3 Exercises: 67

Answer

$20-15i$

Work Step by Step

Combine using difference of squares. $(4-i^2)(4+3i)$ Use the FOIL method to multiply the binomials. $16-12i-4i^2+3i^3$ Substitute $-1$ for $i^2$. $16-12i-4(-1)+3i(-1)$ Add/subtract like terms. $20-15i$
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