document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=100047>Question 100047</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can't get these two - need to choose correct conic from the equation:\r<BR>\n" );
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document.write( "1.     y^2 - 16x^2 - 14y + 17 = 0 - can't get that one<BR>\n" );
document.write( "2.     x^2 + y^2 - 20x - 16y + 64 =0   I said hyperbola?????<BR>\n" );
document.write( "Thanks<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 #72852 by </B><A HREF=/tutors/aboutme.mpl?userid=robolthuis><B>robolthuis(1)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robolthuis><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=72852\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> question 2.<BR>\n" );
document.write( "rewrite the formule in the form:<BR>\n" );
document.write( " x^2 - 20x + y^2 -16y = -64<BR>\n" );
document.write( "next <BR>\n" );
document.write( " x^2 -20x is the same as x^2 -20x +100 -100<BR>\n" );
document.write( " x^2 -20x +100 is the same as (x-10)^2<BR>\n" );
document.write( "SO: x^2 -20x is the same as (x-10)^2 -100<BR>\n" );
document.write( "In the same way:<BR>\n" );
document.write( " y^2 -16y is the same as (y-8)^2 -64<BR>\n" );
document.write( "The complete formule becomes:<BR>\n" );
document.write( " (x-10)^2 + (y-8)^2 -164 = -64<BR>\n" );
document.write( "or:<BR>\n" );
document.write( " (x-10)^2 + (y-8)^2 = 100<BR>\n" );
document.write( "this is a circle with centre (10, 8) and radius 10<BR>\n" );
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