Adding and Subtracting Complex Numbers
The addition or subtraction of complex numbers is done by adding and subtracting only real numbers among themselves and also only imaginary numbers among themselves.
(a + bi) + (c + di) = (a + c) + (b + d)i
(a + bi) − (c + di) = (a − c) + (b − d)i
(5 + 2 i) + ( − 8 + 3 i) − (4 − 2i ) =
= (5 − 8 − 4) + (2 + 3 + 2)i = −7 + 7i
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