document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=89696>Question 89696</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How would you write an equation in standard form for an ellipse with foci(5,0)and (-5,0) and y- intercepts of 7 and -7? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #65176 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=65176\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> this ellipse is centered at the origin with the foci on the y-axis so the equation will be of the form <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%5E2%2Fb%5E2%29%2B%28y%5E2%2Fa%5E2%29=1 ALIGN=MIDDLE  ALT=\"%28x%5E2%2Fb%5E2%29%2B%28y%5E2%2Fa%5E2%29=1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "a is the semi-major axis, in this case a=7 ... c is the distance from center to focus, c=5\r<BR>\n" );
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document.write( "b^2=a^2-c^2 ... b^2=49-25 ... b^2=24\r<BR>\n" );
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document.write( "so the equation is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%5E2%2F24%29%2B%28y%5E2%2F49%29=1 ALIGN=MIDDLE  ALT=\"%28x%5E2%2F24%29%2B%28y%5E2%2F49%29=1\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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