document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=388779>Question 388779</A>: <I><SPAN STYLE=\"word-break: break-all;\"> log2(-x)+log2(x+12)=5 check for extraneous solutions. I got -8 and -4 I don't know if it's right and how many solutions.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #275187 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=275187\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> log2(-x)+log2(x+12)=5 check for extraneous solutions. I got -8 and -4 I don't know if it's right and how many solutions.<BR>\n" );
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document.write( "log2(-x)+log2(x+12)=5 <BR>\n" );
document.write( "---<BR>\n" );
document.write( "log2[-x(x+12)] = 5<BR>\n" );
document.write( "----<BR>\n" );
document.write( "-x(x+12) = 2^5<BR>\n" );
document.write( "---<BR>\n" );
document.write( "-x^2-12x-32 = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x^2+12x+32 = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Factor:<BR>\n" );
document.write( "(x+4)(x+8) = 0<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = -4 or x = -8<BR>\n" );
document.write( "---<BR>\n" );
document.write( "No extraneous zeros.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );