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II. For each pair of complex numbers, find a) x ty, b) x-y, c) x . y, and d) = . Write all answers in

II. For each pair of complex numbers, find a) x ty, b) x-y, c) x . y, and d) = . Write all answers in proper, simplest form. 1. x=7 +4i ; y=2-3i 2. x=-1+ 5i ; y=4-7i 3. x = _-21 ; y=6+3i

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