document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=530298>Question 530298</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do you derive the formula 1/2(n^2-n+2 using an^2+bn+c?   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #349994 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=349994\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  How do you derive the formula 1/2(n^2-n+2) using an^2+bn+c? <BR>\n" );
document.write( "------------<BR>\n" );
document.write( "(1/2)n^2 - (1/2)n + 1<BR>\n" );
document.write( "---<BR>\n" );
document.write( "n = [(1/2) +- sqrt((1/4)-4*(1/2)*1)]/1<BR>\n" );
document.write( "----<BR>\n" );
document.write( "etc.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "===== </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );