algebra
posted by Kathy .
4i(2+i) + 2i(4i1)
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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