document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=379445>Question 379445</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need help finding the domain for the following problem:\r<BR>\n" );
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document.write( "f(x)= <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2-9 ALIGN=MIDDLE  ALT=\"x%5E2-9\"   DISABLED_style= \"max-width:90%; height:auto;\" > / <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2-10x%2B21 ALIGN=MIDDLE  ALT=\"x%5E2-10x%2B21\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "I hope that I've input the problem correctly.<BR>\n" );
document.write( "Thanks,<BR>\n" );
document.write( "   Frank </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #269402 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=269402\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The domain of a function are all allowable values for x.<BR>\n" );
document.write( "The only values of x that WOULDN'T be allowed here are those which make the denominator go to zero...so we set it equal to zero and solve it...<BR>\n" );
document.write( "So<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2+-+10x+%2B+21+=+0 ALIGN=MIDDLE  ALT=\"x%5E2+-+10x+%2B+21+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x+-+7%29%28x+-+3%29+=+0 ALIGN=MIDDLE  ALT=\"%28x+-+7%29%28x+-+3%29+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+7+or+x+=+3 ALIGN=MIDDLE  ALT=\"x+=+7+or+x+=+3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Thus the domain is all real numbers except x cannot be 3 or 7. </SPAN>\n" );
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