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6 November, 17:50

Simplify. (6 + 5i) (10 - 15i)

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Answers (2)
  1. 6 November, 20:16
    0
    60 - 90i + 50i - 75i^2

    -75i^2 - 40i + 60

    In imaginary numbers, i stands for the square root of - 1. Knowing this, we know that i^2 is - 1. Therefore:

    -75 (-1) - 40i + 60

    75 + 60 - 40i

    135 - 40i
  2. 6 November, 21:19
    0
    75i^2-140i-60
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