Question

What is the square of the imaginary number 3i?

Answer 1

Answer:

-9

Step-by-step explanation:

Answer 2

−
9
Explanation:
(
3
i
)
2
=
9
i
2
i
2
=
−
1
,
therefore,
9
i
2
=
9
⋅
(
−
1
)
=
−
9