document.write( "Question 307812: Find the coefficient of b^5 in the expansion of (a-2b)^8\r
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document.write( "My answer = 1\r
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document.write( "Not sure if thats right. If you could show me the steps to solving this problem it would be much appreciated. Thank You. :) \n" );
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Algebra.Com's Answer #220884 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! Find the coefficient of b^5 in the expansion of (a-2b)^8 \n" ); document.write( "---------------- \n" ); document.write( "8C3(a^3)(-2b)^5 \n" ); document.write( "--- \n" ); document.write( "= [(8*7*6)/(1*2*3)](a^3)(-32)b^5 \n" ); document.write( "--- \n" ); document.write( "= 56*(-32)a^3b^5 \n" ); document.write( "--- \n" ); document.write( "= -1792a^3b^5 \n" ); document.write( "====================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( " |