SOLUTION: what is the sum of 5i, -9-7i, and 4?

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Question 796306: what is the sum of 5i, -9-7i, and 4?
Answer by Alan3354(69443) About Me  (Show Source):
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what is the sum of 5i, -9-7i, and 4?
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Add the real parts, -9 & 4
Add the i parts, 5i - 7i