(4 + 3i)²



    (4 + 3i)(4 + 3i)



       Use FOIL



  16 + 12i + 12i + 9i²



Combine two middle terms

          and

Use the fact that i² = -1



    16 + 24i + 9(-1) 



      16 + 24i - 9



        7 + 24i



Edwin 

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