document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=810861>Question 810861</A>: <I><SPAN STYLE=\"word-break: break-all;\"> log4(b+27)-log4(b-7)=log4b </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #488510 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=488510\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> log4(b+27)-log4(b-7)=log4b<BR>\n" );
document.write( "log4(b+27) = log4(b-7)+log(4b)<BR>\n" );
document.write( "----<BR>\n" );
document.write( "log4(b+27) = log[4b^2-28b]<BR>\n" );
document.write( "------<BR>\n" );
document.write( "b+27 = 4b^2-28b<BR>\n" );
document.write( "----<BR>\n" );
document.write( "4b^2 -29b -27 = 0<BR>\n" );
document.write( "-------<BR>\n" );
document.write( "Positive solution:<BR>\n" );
document.write( "b = 8.0849<BR>\n" );
document.write( "=================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "===================\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "------<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );