document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=230820>Question 230820</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I solve for r where:\r<BR>\n" );
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document.write( "(1/(1+r))*(30/r)-100 = 0\r<BR>\n" );
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document.write( "I'm getting stuck on the steps in te middle...\"the work\"... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #170948 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=170948\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  How do I solve for r where: <BR>\n" );
document.write( "(1/(1+r))*(30/r)-100 = 0 <BR>\n" );
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document.write( "Multiply thru by r(1+r) to get:<BR>\n" );
document.write( "(30)-100r(r+1) = 0<BR>\n" );
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document.write( "-100r^2-100r+30 = 0<BR>\n" );
document.write( "Divide thru by -10 to get:<BR>\n" );
document.write( "10r^2 + 10r - 3 = 0<BR>\n" );
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document.write( "Use the quadratic formula:<BR>\n" );
document.write( "r = [-10 +- sqrt(100 - 4*10*-3)]/20<BR>\n" );
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document.write( "r = [-10 +- sqrt(220)]/20<BR>\n" );
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document.write( "r = [-10 +- 2sqrt(55)]/20<BR>\n" );
document.write( "x = [-1/2 + (1/10)sqrt(55)] or x = [-1/2 + (1/10)sqrt(55)]<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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