document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=949780>Question 949780</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. Find focus & directrix<BR>\n" );
document.write( "(c,0) & x=-c?\r<BR>\n" );
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document.write( "2. foci of ellipse are on center (0,0) and y-axis. Draw ellipse, length of major axis is 20 and length of minor axis is 6. How would I get the needed information to be able to graph this?\r<BR>\n" );
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document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #579967 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=579967\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> #2 .<BR>\n" );
document.write( "You can pick any point for center on the y axis you want.\r<BR>\n" );
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document.write( "Taking standard form,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-s%29%5E2%2Fb%5E2%2B%28y-k%29%5E2%2Fa%5E2=1 ALIGN=MIDDLE  ALT=\"%28x-s%29%5E2%2Fb%5E2%2B%28y-k%29%5E2%2Fa%5E2=1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-s%29%5E2%2F6%5E2%2B%28y-k%29%5E2%2F20%5E2=1 ALIGN=MIDDLE  ALT=\"%28x-s%29%5E2%2F6%5E2%2B%28y-k%29%5E2%2F20%5E2=1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The center IS ON the y-axis, so s=0.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28x%5E2%2F6%5E2%2B%28y-k%29%5E2%2F20%5E2=1%29 ALIGN=MIDDLE  ALT=\"highlight%28x%5E2%2F6%5E2%2B%28y-k%29%5E2%2F20%5E2=1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "If you are trying to say that the center IS THE ORIGIN,  (0,0), the you have<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight%28highlight%28x%5E2%2F6%5E2%2B%28y%29%5E2%2F20%5E2=1%29%29 ALIGN=MIDDLE  ALT=\"highlight%28highlight%28x%5E2%2F6%5E2%2B%28y%29%5E2%2F20%5E2=1%29%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "This should be understandable enough for you to draw the graph.\r<BR>\n" );
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document.write( "#1:\r<BR>\n" );
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document.write( "Simplify this, which is according to the definition for a parabola:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%28%28x-c%29%5E2%2B%28y-0%29%5E2%29=sqrt%28%28x-%28-c%29%29%5E2%2B%28y-y%29%5E2%29 ALIGN=MIDDLE  ALT=\"sqrt%28%28x-c%29%5E2%2B%28y-0%29%5E2%29=sqrt%28%28x-%28-c%29%29%5E2%2B%28y-y%29%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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