SOLUTION: (3+2i)(3-2i)

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Question 1053304: (3+2i)(3-2i)
Answer by ikleyn(52814) About Me  (Show Source):
You can put this solution on YOUR website!
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(3+2i)(3-2i)
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Trace attentively each my step:


(3+2i)(3-2i) = 3*3  + 3*(-2i)  + (2i)*3  + (2i)*(-2i) = 

                9   - 6i       +  6i     - 4%2Ai%5E2 =   cancel -6i and 6i;  use i%5E2 = -1)

                9                        - 4*(-1)      = 9 + 4 = 13.



Or  (3+2i)(3-2i)  = 3%5E2+-+%282i%29%5E2 = 9+-+4%2Ai%5E2 = 9 -4*(-1) = 9 + 4 = 13.

Done.