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OpenStudy (anonymous):
Compute Z=(1+i)(1+2i)(1+3i).
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OpenStudy (anonymous):
(1+i)(1+2i) = 1 + 2i + i +2(-1) = -1 + 3i (-1 + 3i)(1 + 3i) = -1 -3i + 3i - 9 = -10
OpenStudy (anonymous):
because i^2 = -1 by definition
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