mel720 mel720
  • 25-07-2020
  • Mathematics
contestada

What is the value of the product (4 - 21)(6 + 2/)?
20 - 41
20 + 161
28 + 161
28 - 41

Respuesta :

sqdancefan
sqdancefan sqdancefan
  • 05-08-2020

Answer:

  28 -4i

Step-by-step explanation:

Perhaps you want the product ...

  (4 -2i)(6 +2i)

Multiplying in the usual way, we get ...

  (4)(6) +(4)(+2i) +(-2i)(6) +(-2i)(2i)

  = 24 +8i -12i -4i^2

Recognizing that i^2 = -1, we can collect terms to get ...

  = 24 +i(8 -12) -4(-1)

  = 28 -4i

_____

Please note that i = √(-1) is not the same as 1 or /. You may need to edit your question to ensure the correct symbol is used.

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