document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=741843>Question 741843</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I find the vertices and foci of a parabola? I just need the formula; I can't find it in my textbook. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #452244 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=452244\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> How do I find the vertices and foci of a parabola? I just need the formula; I can't find it in my textbook.<BR>\n" );
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document.write( "There are 4 basic equations for a parabola:<BR>\n" );
document.write( "(x-h)^2=4p(y-k) (parabola opens upward)<BR>\n" );
document.write( "(x-h)^2=-4p(y-k) (parabola opens downward)<BR>\n" );
document.write( "(y-k)^2=4p(x-h) (parabola opens rightward)<BR>\n" );
document.write( "(y-k)^2=-4p(x-h) (parabola opens leftward)<BR>\n" );
document.write( "In every case, (h,k)=(x,y) coordinates of the vertex<BR>\n" );
document.write( "Focus=p-units from the vertex on the axis of symmetry<BR>\n" );
document.write( "p=distance from vertex to focus and directrix on the axis of symmetry. </SPAN>\n" );
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