document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=966659>Question 966659</A>: <I><SPAN STYLE=\"word-break: break-all;\"> log(x^2+7x)=log18<BR>\n" );
document.write( "  I think I'm supposed to get the log on one side, so would it look like this? log18(x^2+7x)<BR>\n" );
document.write( "Do I then write it out like this? log18 x^2 +log18 7x </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #590791 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=590791\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> log(x^2 + 7x) = log(18) can only be true if x^2 + 7x = 18\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "so, start with x^2 + 7x = 18.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "subtract 18 from both sides of the equation to get x^2 + 7x - 18 = 0\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "factor this quadratic equation to get (x + 9) * (x - 2) = 0\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "solve for x to get x = -9 or x = 2.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "go back to your original equation to see if these values are good.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "they have to be good in the original equation, or they are not good.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "your original equation is log(x^2 + 7x) = log(18)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "when x = -9, you get log(x^2 + 7x) = log(18) becomes log(81 - 63) = log(18) which becomes log(18) = log(18) which is true, so x = -9 is good.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "when x = 2, you get log(x^2 + 7x) = log(18) becomes log(4 + 14) = log(18) which becomes log(18) = log(18) which is true, so x = 2 is also good.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "your solution is that x = -9 or x = 2.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );