document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=773821>Question 773821</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how to graph and identify the focus, directrix, and axis of symmetry of x=-y^2<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #472421 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=472421\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> how to graph and identify the focus, directrix, and axis of symmetry of x=-y^2<BR>\n" );
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document.write( "Given equation is that of a parabola which opens leftward.<BR>\n" );
document.write( "Its basic form: (y-k)^2=-4p(x-h), (h,k)=(x,y) coordinates of the vertex.<BR>\n" );
document.write( "..<BR>\n" );
document.write( "y^2=-x<BR>\n" );
document.write( "vertex: (0,0)<BR>\n" );
document.write( "axis of symmetry: y=0<BR>\n" );
document.write( "4p=1<BR>\n" );
document.write( "p=1/4<BR>\n" );
document.write( "focus: (-1/4,0) (p distance to left of vertex on the axis of symmetry)<BR>\n" );
document.write( "directrix: x=1/4 (p distance to right of vertex on the axis of symmetry)<BR>\n" );
document.write( "see graph below:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+graph%28+300%2C+300%2C+-10%2C+10%2C+-10%2C+10%2C+sqrt%28-x%29%2C+-sqrt%28-x%29%29+ ALIGN=MIDDLE  ALT=\"+graph%28+300%2C+300%2C+-10%2C+10%2C+-10%2C+10%2C+sqrt%28-x%29%2C+-sqrt%28-x%29%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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