SOLUTION: how do you do this: (7+5i)(7-5i)

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Question 529168: how do you do this: (7+5i)(7-5i)
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%287%2B5i%29%287-5i%29=7%5E2-%285i%29%5E2+=+49-25i%5E2+=+49-25%28-1%29+=+49%2B25+=+74


So %287%2B5i%29%287-5i%29+=+74


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