xavi2066 xavi2066
  • 22-10-2019
  • Mathematics
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Compute (1+ 2i)(1 − 2i).

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lyndalau86
lyndalau86 lyndalau86
  • 22-10-2019

Answer:

5

Step-by-step explanation:

This is an example of conjugate binomials. So we are  going to solve it like we would do for a regular conjugate binomial. Just remember that i² = -1

So we have:

[tex](1+2i)(1-2i)= (1-4i^2)= (1-4(-1))= 1 +4 = 5[/tex]

Therefore, (1+ 2i)(1 − 2i) = 5

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