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2 votes
(4 + 5i)(4 − 5i). answer please

2 Answers

5 votes

Answer:

41

Explanation:

edg 2020

User Irom
by
8.7k points
3 votes

Answer:

41

Explanation:

(4 + 5i)(4 − 5i)

We know that (a-b) (a+b) = a^2 -b^2

4^2 - ( 5i)^2

16 -25i^2

We know that i^2 = -1

16 -25(-1)

16+25

41

User Yongbok
by
8.3k points

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