document.write( "Question 398234: Find the fourth term in the expansion of (2x-1)^6 \n" ); document.write( "
Algebra.Com's Answer #282186 by Edwin McCravy(20055)\"\" \"About 
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Find the fourth term in the expansion of (2x-1)^6
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document.write( "The Rth term in the expansion of (A + B)N\r\n" );
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document.write( "is C(N,R-1)AN-R+1BR-1.\r\n" );
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document.write( "Therefore substituting A=2x, B=-1, N=6, R=4,\r\n" );
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document.write( "C(6,4-1)(2x)6-4+1(-1)4-1.\r\n" );
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document.write( "C(6,3)(2x)3(-1)3.\r\n" );
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document.write( "20(2x)3(-1).\r\n" );
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document.write( "20(23x3)(-1).\r\n" );
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document.write( "20(8x3)(-1).\r\n" );
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document.write( "-160x3.\r\n" );
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document.write( "Edwin
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