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What is the square of the imaginary number 3i?
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7 votes
What is the square of the imaginary number 3i?

User Mr Rubix
by
2.9k points

2 Answers

7 votes

Answer:

-9

Step-by-step explanation:

User Akelec
by
3.4k points
6 votes
−
9
Step-by-step explanation:
(
3
i
)
2
=
9
i
2
i
2
=
−
1
,
therefore,
9
i
2
=
9
⋅
(
−
1
)
=
−
9
User Dmvianna
by
3.9k points
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