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  • 24-06-2020
  • Mathematics
contestada

Select the correct answer from each drop-down menu.
If x = (10 - 3i) and y= (3 - 10i), then xy=
and r/y

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Wishing Wishing
  • 24-06-2020

Answer:

[tex]xy=30-109i+30i^2[/tex]

Step-by-step explanation:

If x=(10-3i) and y=(3-10i), then xy=

[tex](10-3i)(3-10i)=[/tex]

Using the FOIL method:

First: [tex]30[/tex]

Outer: [tex]-100i[/tex]

Inner: [tex]-9i[/tex]

Last: [tex]30i^2[/tex]

[tex]30-100i-9i+30i^2=\\30-109i+30i^2[/tex]

[tex]xy=30-109i+30i^2[/tex]

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