document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=200171>Question 200171</A>: <I><SPAN STYLE=\"word-break: break-all;\"> give the coordinates of the focus and the equation of the directrix for the parabola with equation y=-(1/2)x2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #150525 by </B><A HREF=/tutors/aboutme.mpl?userid=RAY100><B>RAY100(1637)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=RAY100><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=150525\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> y =  (-1/2) x^2<BR>\n" );
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document.write( "-2y = x^2,,,,,but  x^2 = 4py  (  standard  form)<BR>\n" );
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document.write( "4py = -2y<BR>\n" );
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document.write( "p = -1/2 ,,,,,,focus (0,p),,,, or  focus ( 0 , -1/2)<BR>\n" );
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document.write( "Directrix = -p  (standard  form),,,,Directrix  = - (-1/2),,,or  directrix  =  1/2<BR>\n" );
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