document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=616356>Question 616356</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the center and the radius of a circle whose equation is x^2+y^2 -4x +14y +28=0 ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #387648 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=387648\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the center and the radius of a circle whose equation is <BR>\n" );
document.write( "x^2+y^2 -4x +14y +28=0 ?<BR>\n" );
document.write( "complete the square<BR>\n" );
document.write( "x^2 -4x+y^2+14y +28=0<BR>\n" );
document.write( "(x^2-4x+4)+(y^2+14y+49)=-28+4+49<BR>\n" );
document.write( "(x-2)^2+(y+7)^2=25<BR>\n" );
document.write( "Standard form of equation for a circle:<BR>\n" );
document.write( "(x-h)^2+(y-k)^2=r^2, (h,k)=(x,y) coordinates of center, r=radius<BR>\n" );
document.write( "For given equation:<BR>\n" );
document.write( "center:(2,-7)<BR>\n" );
document.write( "r^2=251<BR>\n" );
document.write( "r=&#8730;25=5<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );