document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=466182>Question 466182</A>: <I><SPAN STYLE=\"word-break: break-all;\"> This is the last question I'll need help with for this week!\r<BR>\n" );
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document.write( "Find all numbers for which the rational expression is undefined:\r<BR>\n" );
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document.write( "r^3-7r/r^2-64\r<BR>\n" );
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document.write( "Thanks! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #319610 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=319610\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The rational expression is undefined when the denominator is zero and the numerator is non-zero (if we get 0/0 we say the expression is indeterminate). Here, we set r^2 - 64 equal to 0, which implies r^2 = 64, r = 8 or -8. In either case, the numerator is non-zero. </SPAN>\n" );
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