document.write( "Question 685005: (3-7i)^2
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Algebra.Com's Answer #424297 by ReadingBoosters(3246)\"\" \"About 
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(3-7i)(3-7i)
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\n" ); document.write( "3(3) + 3(-7i) - 7i(3) - 7i(-7i)
\n" ); document.write( "\"9+-+21i+-+21i+%2B+49i%5E2\"
\n" ); document.write( "knowing \"i+=+sqrt%28-1%29\" and \"i%5E2+=+sqrt%28-1%29%5E2+=+-1\"
\n" ); document.write( "9 - 42i + 49(-1)
\n" ); document.write( "9 - 42i - 49
\n" ); document.write( "\"highlight_green%28-40-42i%29\"\r
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