document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1132939>Question 1132939</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Sn=a(subscript1)x(1-r^n/1-r) is the formula if given are positive= 1/9+8/9+etc.<BR>\n" );
document.write( "But what if the given are negative= -1-8-64-512...-(8)^n-1 or subtraction. Is the formula the same? or do is it flip and turn int0 a1x(1+r^n/1+r)? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #750099 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20850)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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/cgi-bin/show-face.mpl?user=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=750099\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "if <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%3C1 ALIGN=MIDDLE  ALT=\"r%3C1\"   DISABLED_style= \"max-width:90%; height:auto;\" > you would use <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S%5Bn%5D=a%5B1%5D%28%281-r%5En%29%2F%281-r%29%29 ALIGN=MIDDLE  ALT=\"S%5Bn%5D=a%5B1%5D%28%281-r%5En%29%2F%281-r%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "if <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%3E1 ALIGN=MIDDLE  ALT=\"r%3E1\"   DISABLED_style= \"max-width:90%; height:auto;\" > you would use <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=S%5Bn%5D=a%5B1%5D%28%28r%5En-1%29%2F%28r-1%29%29 ALIGN=MIDDLE  ALT=\"S%5Bn%5D=a%5B1%5D%28%28r%5En-1%29%2F%28r-1%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );