The problem
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I am getting a different answer -2+9i
Answer provided by our tutors
You probably have typo in your equation since:

However, if you type "(3 + 2i) - (5 - 7i)" you will get "-2 + 9i":

I am getting a different answer -2+9i
You probably have typo in your equation since:

However, if you type "(3 + 2i) - (5 - 7i)" you will get "-2 + 9i":

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