Multiply -3i*(3i)

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

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