Multiply -3i*(3i)

Math
-3i⋅(3i)
Multiply -3i(3i).
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Multiply 3 by -3.
-9ii
Raise i to the power of 1.
-9(i1i)
Raise i to the power of 1.
-9(i1i1)
Use the power rule aman=am+n to combine exponents.
-9i1+1
Add 1 and 1.
-9i2
-9i2
Rewrite i2 as -1.
-9⋅-1
Multiply -9 by -1.
9
Multiply -3i*(3i)

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