document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=415595>Question 415595</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is the focal length of <BR>\n" );
document.write( " (x &#8722; 4) ^2 /36 + (y + 5) ^2/ 25 = 1 <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 #291346 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=291346\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> what is the focal length of<BR>\n" );
document.write( "(x &#8722; 4) ^2 /36 + (y + 5) ^2/ 25 = 1 \r<BR>\n" );
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document.write( "(x&#8722;4)^2/36+(y+5)^2/25=1 <BR>\n" );
document.write( "This is an ellipse with centers at (4,-5) with horizontal major axis.<BR>\n" );
document.write( "Standard form for this ellipse: (x-h)^2/a^2+(y-k)^2/b^2=1 with center at (h,k)<BR>\n" );
document.write( "a^2=36<BR>\n" );
document.write( "b^2=25<BR>\n" );
document.write( "c^2=a^2-b^2<BR>\n" );
document.write( "c=sqrt(36-25)=sqrt(11)<BR>\n" );
document.write( "ans:<BR>\n" );
document.write( "focal length of ellipse=sqrt(11) </SPAN>\n" );
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