document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=459600>Question 459600</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help me with this,how do I find the domain?  fx=  (3x-8)/(4x+20) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #315208 by </B><A HREF=/tutors/aboutme.mpl?userid=math-vortex><B>math-vortex(648)</B></A><img src=\"/images/stars/stars-11.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math-vortex><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=math-vortex><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=315208\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> When you are working with real numbers, the main things that will limit your domain are (1) taking the square root of a negative number, and (2) division by zero.<BR>\n" );
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document.write( "In your problem, 4x + 20 is in the denominator, so we want to avoid division by zero. Set this expression equal to zero to find the value of x.<BR>\n" );
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document.write( "4x + 20 = 0<BR>\n" );
document.write( "4x = -20<BR>\n" );
document.write( "x = -5\r<BR>\n" );
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document.write( "We see that x cannot equal -5 because we would be dividing by zero. Your domain is all real numbers except -5. \r<BR>\n" );
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document.write( "Note: I'm still learning to use the formula rendering software on this website. As soon as I figure out how to write out this domain symbolically, I'll edit the solution. If you need the answer before then, post a question asking how to represent this domain mathematically. \r<BR>\n" );
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document.write( "Hope this helps! </SPAN>\n" );
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