document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=731589>Question 731589</A>: <I><SPAN STYLE=\"word-break: break-all;\"> identify the focus and directrix of the equation:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x=-1%2F16y%5E2 ALIGN=MIDDLE  ALT=\"x=-1%2F16y%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "|a|=1/4c<BR>\n" );
document.write( "|-1/16|=1/4c<BR>\n" );
document.write( "|1/16|=1/4c<BR>\n" );
document.write( "16=4c<BR>\n" );
document.write( "16/4=c<BR>\n" );
document.write( "c=4<BR>\n" );
document.write( "(-4,0) is the focus? and 4 is the directrix?<BR>\n" );
document.write( " </SPAN>\n" );
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document.write( "it's correct, (-4,0) is the focus and 4 is the directrix </SPAN>\n" );
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