For i = sqrt(-1), what is the sum (7 + 3i) + (-8 + 9i)?
A-1 + 12i
B-1 - 6i
C15 + 12i
D15 - 6i
Answer & Solution
Correct answer: A. -1 + 12i
Add real parts: 7 + (-8) = -1. Add imaginary parts: 3i + 9i = 12i. Result: -1 + 12i.
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