document.write( "Question 1125262: the sum of the first n terms of a series is 5n^2-2n. the r-1 term is \n" ); document.write( "

Algebra.Com's Answer #741592 by ikleyn(52781) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "

\r\n" );
document.write( "HINT :  The (r-1)-th term is equal to\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "the sum of the first (r-1) terms  MINUS  the sum of the first (r-2) terms, i.e.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "5*(r-1)^2-2*(r-1)                  -       (5*(r-2)^2-2*(r-2)).\r\n" );
document.write( "

\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Based on this hint, you can complete the assignment on your own by simplifying this expression.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );