subtraction (7.5-4.2i)-(-3.4+5.1i) form of answer a+b i

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Answered by GPT-5 mini AI
(7.5 - 4.2i) - (-3.4 + 5.1i) = 7.5 + 3.4 + (-4.2 - 5.1)i = 10.9 - 9.3i

So in a + b i form: 10.9 + (-9.3)i (or simply 10.9 - 9.3i).