document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=166883>Question 166883</A>: <I><SPAN STYLE=\"word-break: break-all;\"> PLEASE HELP!!!<BR>\n" );
document.write( "Write an equation for the parabola with focus (4,0) and directrix y=2<BR>\n" );
document.write( "I must show my work.<BR>\n" );
document.write( "Thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #123004 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=123004\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a general form for the equation of a parabola is __ (x-h)^2=4p(y-k)<BR>\n" );
document.write( "__ where (h,k) is the vertex and p is the distance from the vertex to the focus\r<BR>\n" );
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document.write( "the vertex is midway between the focus and the directrix<BR>\n" );
document.write( "__ in this case, (4,1)<BR>\n" );
document.write( "__ so p=-1\r<BR>\n" );
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document.write( "the equation would be (x-4)^2=-4(y-1)\r<BR>\n" );
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document.write( "solving for y gives y=(-1/4)(x-4)^2 + 1 </SPAN>\n" );
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