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27 August, 02:35

What is (5+2i) * (5+2i) ?

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Answers (2)
  1. 27 August, 03:35
    0
    25+10i+10i+4i^2

    25-4

    21+20i

    20i+21
  2. 27 August, 03:57
    0
    (5+2i) * (5+2i)

    Distribute ...

    25 + 10 i + 10 i + 4i^2

    Remember ... when there is a number with i^2 it will equal to (-1) ...

    So that means in this question ... I replace 4i^2 with - 4 because 4 (-1) = - 4

    Now I can combine like terms ...

    25 + 10i + 10i - 4

    Soo ... The answer is 21 + 20i
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