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Mathematics, 02.10.2020 16:01 samariahmiddlebrooks

Simplify the expression (10 + 3i)(10 − 3i). I understand how to distribute and what not, i just don't know what to do with i.

I got to -9i^2+10

1st CORRECT answer gets brainiest .
i=i
i^2=-1
i^3=-i
i^4=1

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