$12 + 9i$
Work Step by Step
$3i(2 - i)^2= 3i(4 -2i - 2i + i^2) = 3i(4 - 4i + (-1)) $ $= 3i(3 - 4i) = 9i - 12i^2 = 3i - 12(-1) = 12 + 9i$
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