SOLUTION: (3i)-(7i)-(-1-i) My teacher gave me the answer which is 1-(3i) I can not figure out how she did and need to know for a test tomorrow Thank you

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Question 172827: (3i)-(7i)-(-1-i) My teacher gave me the answer which is 1-(3i) I can not figure out how she did and need to know for a test tomorrow Thank you
Found 3 solutions by checkley77, nerdybill, Mathtut:
Answer by checkley77(12844)   (Show Source):
You can put this solution on YOUR website!
(3i)-(7i)-(-1-i
3i-7i+1+i
-7i+4i+1
-3i+1 or 1-3i ans.

Answer by nerdybill(7384)   (Show Source):
You can put this solution on YOUR website!
(3i)-(7i)-(-1-i)
Combine first two terms to get:
-(4i)-(-1-i)
distribute the negative sign to terms inside right parenthesis:
-(4i)+1+i
-4i+1+i
Finally, combine terms:
1-3i

Answer by Mathtut(3670)   (Show Source):
You can put this solution on YOUR website!
.......-(-1-i) = 1+i
:
so
:
or