Answer
$35+20i$
Work Step by Step
We can use the distributive property to simplify the given expression.
$5i(4-7i)=(5i)(4)+(5i)(-7i)=20i-35i^{2}=20i-(35\times-1)=20i-(-35)=20i+35=35+20i$
We know that $i^{2}=-1$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 463: 36
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