Question Detail
Question
Suppose that \( (x + y) + i(x - y) = 4 \), find \( x - y \) in the equation
Correct Answer
Option B is the correct answer.
Detailed Explanation
For two complex numbers to be equal, the real parts and imaginary parts must be equal. Here, the right-hand side is 4, which is 4 + 0i. So we have: x + y = 4 and x - y = 0. Therefore, x - y = 0.
Hint
Equate real and imaginary parts separately.