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OpenStudy (anonymous):
(9+4i)^2
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OpenStudy (anonymous):
9^2 - 4^2 + 2.4.9i = 12 + 72i
OpenStudy (anonymous):
(9+4i)(9+4i)= 81+36i+36i+16i^2 81-16 + 72i= 65+72i
OpenStudy (anonymous):
\[-16=16(i^2)=16(-1)\]
OpenStudy (anonymous):
so the answer is just going to be 65+72i (simons 9^2 does not equal 28 =/
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