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Kailyn Waters
Mathematics
11 September, 13:58
What is the sum of (5+3i) and (5-3i)
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Brynlee Black
11 September, 14:12
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Sum means to add together
you can think of the imaginary number "i" to be like a variable x
then its a matter of adding up like terms
the sum of (5+3i) and (5-3i) is
(5+3i) + (5-3i)
now, following pemdas and doing the parenthesis first, you'll notice that you cant add up a real and an imaginary number together, so you're done with the parenthesis, now you're left with
5+3i + 5-3i
rearranging using commutative property
5+5+3i-3i
and now adding up like terms
5+5 = 10
3i-3i=0
so what you get is just
10
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Lila Dudley
11 September, 14:13
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(5+3i) + (5-3i) = 10i
5+3i = 8i
5-3i = 2i
8i+2i=10i
(Although I'm not sure why the "i" is needed if it is a real number)
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