algebra2-imaginary numbers

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You can add or subtract complex numbers by treating the i as a variable and combining like terms.
I am having a lot of trouble figuring out these equations with imaginary numbers.
1. (3+2i)+(7-i)=
3. (2+i)-(3+i)=
Can someone please walk me through how to do these problems? Thanks.


3 + 2i + 7-i=

3 + 7 + 2i - i =

10 + i

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