document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=315759>Question 315759</A>: <I><SPAN STYLE=\"word-break: break-all;\"> List all numbers for which the rational expression is undefined<BR>\n" );
document.write( " x^2-4/x^2-8x+15  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #225900 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=225900\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Undefined if the denominator is zero <BR>\n" );
document.write( "so we set x^2-8x+15  to zero and solve for x<BR>\n" );
document.write( ".<BR>\n" );
document.write( "x^2-8x+15 = 0<BR>\n" );
document.write( "(x-5)(x+3) = 0<BR>\n" );
document.write( "x = {-3, 5} </SPAN>\n" );
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