softballislove3
Find the product of the complex number and its conjugate.
1 + 3i
Answer : 1  9i correct??



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hereweg0
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multipy that and 13i

hereweg0
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so yu will get 10

katiebugg
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was gonna say that :P

hereweg0
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whatever katie... lies.

softballislove3
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thank you

hereweg0
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welcome. anytime.

katiebugg
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i was typyin was i not :P

jim_thompson5910
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In general
(a+b)(ab) = a^2b^2
So
(1+3i)(13i)
1^2  (3i)^2
1  9i^2
1  9(1)
1+9
10
which means
(1+3i)(13i) = 10

softballislove3
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thanks @jim_thompson5910

jim_thompson5910
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you're welcome