document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1146283>Question 1146283</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The sum of the first 8 terms of a geometrical series is 17 times the sum of its first 4 terms. Find the common ratio.\r<BR>\n" );
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document.write( "This is the equation I have come up with (a is first term, r is common ratio):\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28a%28r%5E8-1%29%29%2F%28r-1%29+=+%2817a%28r%5E4-1%29%29%2F%28r-1%29 ALIGN=MIDDLE  ALT=\"%28a%28r%5E8-1%29%29%2F%28r-1%29+=+%2817a%28r%5E4-1%29%29%2F%28r-1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "But I don't really know how to solve it. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #767567 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=767567\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "In your equation, the \"a\" in the numerator and the \"r-1\" in the denominator are the same, so the equation simplifies to<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28r%5E8-1%29+=+17%28r%5E4-1%29 ALIGN=MIDDLE  ALT=\"%28r%5E8-1%29+=+17%28r%5E4-1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Then on the left note that<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E8-1+=+%28r%5E4%2B1%29%28r%5E4-1%29 ALIGN=MIDDLE  ALT=\"r%5E8-1+=+%28r%5E4%2B1%29%28r%5E4-1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "That should lead you quickly to TWO solutions to the problem. </SPAN>\n" );
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