document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=607150>Question 607150</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve log x+log(x+21)=2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #382442 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=382442\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> log(x) + log(x+21) = 2\r<BR>\n" );
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document.write( "log(x(x+21)) = 2\r<BR>\n" );
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document.write( "log(x^2+21x) = 2\r<BR>\n" );
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document.write( "x^2+21x = 10^2\r<BR>\n" );
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document.write( "x^2+21x = 100\r<BR>\n" );
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document.write( "x^2+21x-100 = 0\r<BR>\n" );
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document.write( "(x-4)(x+25) = 0\r<BR>\n" );
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document.write( "x-4=0 or x+25=0\r<BR>\n" );
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document.write( "x=4 or x=-25\r<BR>\n" );
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document.write( "Throw out the negative solution since you can't take the log of a negative number.\r<BR>\n" );
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document.write( "So the only solution is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=4 ALIGN=MIDDLE  ALT=\"x=4\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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