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posted by Kathy on Wednesday, September 3, 2014 at 6:25pm.

4i(2+i) + 2i(4i-1) 8i +41^ +8i^-2i 12i^+6i

what you meant in your second line was: 8i + 4i^2 + 8i^2 - 2i = 6i + 12i^2 = 6i + 12(-1) = 6i - 12

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