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22 November, 06:12

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

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Answers (2)
  1. 22 November, 07:24
    0
    25+10i+10i+4i^2

    25-4

    21+20i

    20i+21
  2. 22 November, 07:42
    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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