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4 July, 18:47

Simplify (9-7i) (11+8i)

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Answers (2)
  1. 4 July, 18:58
    0
    Usually in these kinds of question I like to keep the variables in front, but that's just my thing so it's your call whether you want to do it or not.

    (9 - 7i) (11 + 8i) = (-7i + 9) (8i + 11)

    Multiply:

    (-56i^2 + - 77i) + (72i + 99) = - 56i^2 - 5i + 99
  2. 4 July, 19:05
    0
    According to WolframAlpha, the answer is 155 - 5i
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