document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=193914>Question 193914</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please Find the radius and center of each circle.\r<BR>\n" );
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document.write( "12. (x - 2)^2 + (y - 3)^2 = 16 <BR>\n" );
document.write( "13. x^2 + (y + 4)^2 = 8<BR>\n" );
document.write( "14. (x + 1)^2 + (y - 2)^2 = 12 <BR>\n" );
document.write( "15. (x - 6)^2 + y^2 = 25 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #145722 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=145722\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Garamond\" size=\"+2\">\r<BR>\n" );
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document.write( "The equation of a circle with center at <b>(<i>h, k</i>)</b> is:\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \ \ \ \ \ \ \ \ \ \ (x - h)^2 + (y - k)^2 = r^2\">\r<BR>\n" );
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document.write( "So, for your first problem, the center is at (2, 3) and the radius is <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE \sqrt{16} = 4\">\r<BR>\n" );
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document.write( "Do the rest of them the same way.\r<BR>\n" );
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document.write( "<b>Hint:</b> <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE x^2 = (x - 0)^2\">\r<BR>\n" );
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document.write( "<b>Hint:</b> if <IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE r^2\"> is not a perfect square, leave the answer in radical form.\r<BR>\n" );
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document.write( "John<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE e^{i\pi} + 1 = 0\"><BR>\n" );
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