Question

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

Answer 1

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

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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.