document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=977416>Question 977416</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the explicit formula for the geometric sequence with a9 = 128 and r = 2. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #598946 by </B><A HREF=/tutors/aboutme.mpl?userid=Cromlix><B>Cromlix(4381)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Cromlix><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=Cromlix><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=598946\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Hi there,<BR>\n" );
document.write( "Using the formula:<BR>\n" );
document.write( "a(n) = a(1)(r)^n -1<BR>\n" );
document.write( "a(9) = a(1)*(2)^8 = 128<BR>\n" );
document.write( "a(1)* 256 = 128<BR>\n" );
document.write( "a(1) = 0.5<BR>\n" );
document.write( "Explicit formula =<BR>\n" );
document.write( "a(n) =0.5*(r)^n-1<BR>\n" );
document.write( "Hope this helps:-) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );