document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1172023>Question 1172023</A>: <I><SPAN STYLE=\"word-break: break-all;\"> vertex= (0,4) directrix=y=-1 <BR>\n" );
document.write( "parabola opens up <BR>\n" );
document.write( "what is the directrix equation and the vertex equation? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #796939 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39617)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=796939\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> distance from vertex and either focus or directrix is 5 units.  Equation of the parabola may have a factor, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2A5=20 ALIGN=MIDDLE  ALT=\"4%2A5=20\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20%28y-4%29=x%5E2 ALIGN=MIDDLE  ALT=\"20%28y-4%29=x%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >-----------this would be one of the equations you want.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "-\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20%28y-4%29=%28x-0%29%5E2 ALIGN=MIDDLE  ALT=\"20%28y-4%29=%28x-0%29%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >, a longer way to write the basic equation. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );