document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=440153>Question 440153</A>: <I><SPAN STYLE=\"word-break: break-all;\">  Write the quadratic function in the vertex form. <BR>\n" );
document.write( "y = x2 - 20x  <BR>\n" );
document.write( " A. y = (x + 20) 2 - 20  <BR>\n" );
document.write( "B. y = (x - 20) 2 - 400  <BR>\n" );
document.write( "C. y = (x - 10) 2 - 100  <BR>\n" );
document.write( "D. y = (x + 10) 2 - 10  <BR>\n" );
document.write( " <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #304122 by </B><A HREF=/tutors/aboutme.mpl?userid=rapaljer><B>rapaljer(4671)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rapaljer><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=rapaljer><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=304122\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In order to \"complete the square on x^2-20x, you have to take HALF of the coefficient of -20x which would be -10.  The only answer that has (x-10)^2 is C.  Moreover, if you expand (x-10)^2 -100, you get x^2-20x, which is correct!!\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Dr. Robert J. Rapalje, Retired<BR>\n" );
document.write( "Seminole State College of Florida\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );