document.write( "Question 391749: what is the middle term in the expansion of \r
\n" ); document.write( "\n" ); document.write( "(x - 1/x)^6 ?? \n" ); document.write( "
Algebra.Com's Answer #278978 by robertb(5830)\"\" \"About 
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The binomial expansion has 6 + 1 = 7terms, so the middle term is the fourth term.\r
\n" ); document.write( "\n" ); document.write( "From the binomial theorem, the fourth term is \"6C3%2Ax%5E3%2A%28-1%2Fx%29%5E3+=+20%2Ax%5E3%2A%28-1%2Fx%5E3%29+=+-20\".\r
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