document.write( "Question 552629: In a sequence, what is the difference in this one? -4.5,-12.5,-62.5 \n" ); document.write( "
Algebra.Com's Answer #360426 by AnlytcPhil(1806)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "There is no common difference, because that is not an arithmetic sequence.\r\n" );
document.write( "It's also not a geometric sequence, because there is no common ratio.\r\n" );
document.write( "\r\n" );
document.write( "However the nth term has this formula:\r\n" );
document.write( "\r\n" );
document.write( "an = -21nē+55n-38.5 \r\n" );
document.write( "\r\n" );
document.write( "And the sequence taken to a few more terms is:\r\n" );
document.write( "\r\n" );
document.write( "-4.5,-12.5,-62.5, -154.5, -288.5, -464.5, ...\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" ); document.write( "
\n" );