document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=135862>Question 135862</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0321356896/algebrahomeworkh>A Graphical Approach to College Algebra</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> 39. lnx+lnx^2=3<BR>\n" );
document.write( "The answer is {e}, but hot did they get that?\r<BR>\n" );
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document.write( "41. logx+log(x-21)=2\r<BR>\n" );
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document.write( "The answer is {25}, but how did they get that? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #99527 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=99527\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  39. lnx+lnx^2=3<BR>\n" );
document.write( "ln(x^3) = 3<BR>\n" );
document.write( "x^3 = e^3<BR>\n" );
document.write( "x = e<BR>\n" );
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document.write( "The answer is {e}, but hot did they get that? <BR>\n" );
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document.write( "41. logx+log(x-21)=2 <BR>\n" );
document.write( "log(x(x-21)) = 2<BR>\n" );
document.write( "log(x^2-21x) = 2<BR>\n" );
document.write( "x^2-21x=10^2<BR>\n" );
document.write( "x^2-21x-100 = 0<BR>\n" );
document.write( "(x-25)(x+4) = 0<BR>\n" );
document.write( "x=25 or x=-4<BR>\n" );
document.write( "But x cannot be -4 as that would give you log(-4) in the problem;<BR>\n" );
document.write( "log(-4) is meaningless.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "The answer is {25}, but how did they get that?<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );