sierra73 sierra73
  • 25-10-2017
  • Mathematics
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9i(4+5i) multiply the following

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altavistard
altavistard altavistard
  • 25-10-2017
Recall that i^2 = -1.

9i(4) = 36i, and 9i(5i) = 45(-1) = - 45.

Thus, the desired product is -45 + 36i.
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