document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=794245>Question 794245</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Write the equation of a parabola with vertex (1, -9) and directrix y = -9 - 7.<BR>\n" );
document.write( "What is the focus of the equation?<BR>\n" );
document.write( "What is the axis of symmetry?<BR>\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 #480706 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=480706\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Write the equation of a parabola with vertex (1, -9) and directrix y = -9 - 7.<BR>\n" );
document.write( "What is the focus of the equation?<BR>\n" );
document.write( "What is the axis of symmetry?<BR>\n" );
document.write( "***<BR>\n" );
document.write( "I assume you meant the directrix to be y=-7<BR>\n" );
document.write( "Parabola opens downward<BR>\n" );
document.write( "Its basic form of equation:(x-h)^2=-4p(y-k)<BR>\n" );
document.write( "For given parabola:<BR>\n" );
document.write( "p=2 (distance from vertex to directrix on the axis of symmetry)<BR>\n" );
document.write( "4p=8<BR>\n" );
document.write( "equation:(x-1)^2=-8(y+9)<BR>\n" );
document.write( "axis of symmetry: x=1<BR>\n" );
document.write( "focus: (1,-11) (p-distance below vertex on the axis of symmetry) </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );