document.write( "Question 737282: Please help me find the fifth term in this expression (x+3y)^8. I tired to solve it using the nCr on the calculator, but it didn't make any sense, so now I don't know what to do. \n" ); document.write( "
Algebra.Com's Answer #450271 by Ed Parker(21)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "The rth term of (A + B)N is  \"%28matrix%282%2C1%2CN%2Cr-1%29%29A%5E%28r-1%29%2AB%5E%28N-r%2B1%29\"\r\n" );
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document.write( "For (x + 3y)5        \r\n" );
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document.write( "Substitute x for A, 3y for B, 8 for N, and 5 for r\r\n" );
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document.write( "    \"%28matrix%282%2C1%2C8%2C5-1%29%29%28x%29%5E%285-1%29%2A%283y%29%5E%288-5%2B1%29\"\r\n" );
document.write( "\r\n" );
document.write( "    \"%28matrix%282%2C1%2C8%2C4%29%29x%5E4%2A%283y%29%5E4\"\r\n" );
document.write( "\r\n" );
document.write( "    \"%28matrix%282%2C1%2C8%2C4%29%29x%5E4%2A3%5E4y%5E4\"\r\n" );
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document.write( "    \"%28matrix%282%2C1%2C8%2C4%29%29x%5E4%2A81y%5E4\"\r\n" );
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document.write( "Now we use  nCr to find \"%28matrix%282%2C1%2C8%2C4%29%29\" \r\n" );
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document.write( "Press ON\r\n" );
document.write( "Press CLEAR\r\n" );
document.write( "Press 8\r\n" );
document.write( "Press MATH\r\n" );
document.write( "Press left arrow once to highlight PRB\r\n" );
document.write( "Press 3\r\n" );
document.write( "          Read 8 nCr\r\n" );
document.write( "Press 4   Read 8 nCr 4\r\n" );
document.write( "Press ENTER\r\n" );
document.write( "          Read 70\r\n" );
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document.write( "Substitute 70 for \"%28matrix%282%2C1%2C8%2C4%29%29\"\r\n" );
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document.write( "    \"70x%5E4%2A81y%5E4\" \r\n" );
document.write( "  \r\n" );
document.write( "    \"5670x%5E4%2Ay%5E4\"\r\n" );
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document.write( "Edwin
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