document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=161959>Question 161959</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What is the standard equation of the circle with radius 4, and center (0,0)? \r<BR>\n" );
document.write( "\n" );
document.write( "A (x+4)^2 + y^2 = 16<BR>\n" );
document.write( "B (x+4)^2 + (y+4)^2 = 16<BR>\n" );
document.write( "C (x+4)^2 + (y+4)^2 = 0<BR>\n" );
document.write( "D x^2 + y^2 = 0<BR>\n" );
document.write( "E ^2 + y^2 = 4<BR>\n" );
document.write( "F x^2 + y^2 = 16\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "I have no idea where to start on this. Id apperciate seeing the steps and the correct answer. Thank you so much for all your help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #119342 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=119342\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The formula for any circle is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-h%29%5E2%2B%28y-k%29%5E2=r%5E2 ALIGN=MIDDLE  ALT=\"%28x-h%29%5E2%2B%28y-k%29%5E2=r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > where the center is at (h,k) and the radius is \"r\"\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So in this case, the center is (0,0) which means that h=0 and k=0. Also, the radius is 4 which means that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=4 ALIGN=MIDDLE  ALT=\"r=4\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So the equation goes from <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-h%29%5E2%2B%28y-k%29%5E2=r%5E2 ALIGN=MIDDLE  ALT=\"%28x-h%29%5E2%2B%28y-k%29%5E2=r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-0%29%5E2%2B%28y-0%29%5E2=4%5E2 ALIGN=MIDDLE  ALT=\"%28x-0%29%5E2%2B%28y-0%29%5E2=4%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > after plugging in the given data\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Now simplify to get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2%2By%5E2=16 ALIGN=MIDDLE  ALT=\"x%5E2%2By%5E2=16\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So the answer is F </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );