document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=148681>Question 148681</A>: <I><SPAN STYLE=\"word-break: break-all;\">  <BR>\n" );
document.write( "I just can not remember how to set this problem up.\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #109016 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=109016\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A number is 20 less that its square. Find all such numbers.<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Let x = a number(s)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "x = x^2 - 20<BR>\n" );
document.write( "0 = x^2 -x - 20<BR>\n" );
document.write( "Factoring we get:<BR>\n" );
document.write( "0 = (x-5)(x+4)<BR>\n" );
document.write( ".<BR>\n" );
document.write( "Solution: x = {5, -4}<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );