document.write( "Question 74041: please help me with this particular problem..thanks
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document.write( "Find the constant term or the term independent of x in the expansion of
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document.write( "(3x-5/x^2)^9.\r
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document.write( "this is a paper given as a study guide.thanks \n" );
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Algebra.Com's Answer #53082 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! Rewrite as: \n" ); document.write( "(3x - 5x^-2)^9 \n" ); document.write( "This is a binomial; the expansion contains 10 terms; \n" ); document.write( "Look at the powers of \"x\" in the eqpansion \n" ); document.write( "1st term has (x)^9(x^-2)^0) \n" ); document.write( "2nd term has (x)^8(x^-2)^1 = x^6 \n" ); document.write( "3rd term has (x)^7(x^-2)^2 = x^3 \n" ); document.write( "4th term has (x)^6(x^-2)^3 = x^6*x^-6 = 1 \n" ); document.write( "So the 4th term is a \"constant\" term. \n" ); document.write( "--------------- \n" ); document.write( "The complete 4th term is: \n" ); document.write( "9C6*(3x)^6*(-5x^-2)^3 = 84*729x^6*-125x^-6 \n" ); document.write( "=-7654500 \n" ); document.write( "============ \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " \n" ); document.write( " |