$ -2 + 9i$
Work Step by Step
Subtract each term of the subtrahend $=3 + 2i - 5 - (-7i) \\=3 + 2i - 5 +7i$ Regroup then simplify by combining like terms to obtain $=(3 - 5) + (2i+7i) \\= -2 + 9i$
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