Question

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

Answer 1

Answer:

Step-by-step explanation:

91 − 60 i

Answer 2

Answer:

109

Step-by-step explanation: