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OpenStudy (anonymous):
(2 - 3i)^2(2 + 3i)^2
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OpenStudy (saifoo.khan):
169
OpenStudy (anonymous):
well that can be rewritten as ((2-3i)(2+3i))^2..now we know that (2-3i)(2+3i)=4-9i^2...difference between two squares rule in reverse. now we get (4-9i^2)^2..which is 16 - 72i^2 + 81i^4...16+72+81=169
OpenStudy (anonymous):
Yeap 169
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