document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=724585>Question 724585</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the center and radius of the circle with the given equation? <BR>\n" );
document.write( "(x – 1)^2 + (y + 1)^2 = 4 \r<BR>\n" );
document.write( "\n" );
document.write( "center (–1, 1); radius 4<BR>\n" );
document.write( "center (1, –1); radius 4<BR>\n" );
document.write( "center (–1, 1); radius 2<BR>\n" );
document.write( "center (1, –1); radius 2 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #443810 by </B><A HREF=/tutors/aboutme.mpl?userid=AnlytcPhil><B>AnlytcPhil(1806)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=AnlytcPhil><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=AnlytcPhil><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=443810\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (x – 1)² + (y + 1)² = 4 \r<BR>\n" );
document.write( "\n" );
document.write( "Compare it to\r<BR>\n" );
document.write( "\n" );
document.write( "(x – h)² + (y - k)² = r²\r<BR>\n" );
document.write( "\n" );
document.write( "x - 1 = x - h<BR>\n" );
document.write( "    h = 1\r<BR>\n" );
document.write( "\n" );
document.write( "y + 1 = y - k<BR>\n" );
document.write( "    k = -1\r<BR>\n" );
document.write( "\n" );
document.write( "So the center = (h,k) = (1,-1)\r<BR>\n" );
document.write( "\n" );
document.write( "r² = 4<BR>\n" );
document.write( " r = 2\r<BR>\n" );
document.write( "\n" );
document.write( "So the radius is 2. \r<BR>\n" );
document.write( "\n" );
document.write( "Edwimn</pre>   </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );