document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=271677>Question 271677</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find all numbers for which the rational expression is undefined:\r<BR>\n" );
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document.write( "s^3-9s/s^2-4\r<BR>\n" );
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document.write( "Please explain the answer.\r<BR>\n" );
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document.write( "PLEASE HELP!!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #198837 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=198837\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find all numbers for which the rational expression is undefined:<BR>\n" );
document.write( "s^3-9s/s^2-4 <BR>\n" );
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document.write( "If you divide anything by a zero, it is considered \"undefined\".  That is, when the denominator equals zero your rational expression will be undefined.<BR>\n" );
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document.write( "So, if we set the denominator (s^2-4) to zero and solve for s we'll find your answer:<BR>\n" );
document.write( "s^2-4 = 0<BR>\n" );
document.write( "s^2 = 4<BR>\n" );
document.write( "s = sqrt(4)<BR>\n" );
document.write( "s = {-2,2}  (this is what they are looking for) </SPAN>\n" );
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