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30 December, 15:26

Which is the product of the following numbers?

-4 (-3 + 9i) (5 - 6i)

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Answers (1)
  1. 30 December, 19:09
    0
    expand ( - 3 + 9i) (5 - 6i) using the FOIL method

    = - 4 ( - 15 + 18i + 45i - 54i²) → i² = (√ - 1) ² = - 1

    = - 4 ( - 15 + 63i + 54)

    = - 4 (39 + 63i) (distribute by - 4)

    = - 156 - 252i ← in standard form
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