document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=293618>Question 293618</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am trying to find the vertex for : f(x)=-x^2+10x+5. I am stuck...<BR>\n" );
document.write( "(-x^2+10x+25-25)+5<BR>\n" );
document.write( "(-x^2+10x+25)+(25+5)<BR>\n" );
document.write( "(x+5)(x+5)<BR>\n" );
document.write( "I think I am doing this wrong. The negative in front of the x^2 is throwing me off... any help will be appreciated!  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #211908 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=211908\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Standard \"vertex form\" is<BR>\n" );
document.write( "y= a(x-h)^2+k<BR>\n" );
document.write( "where (h,k) is the vertex<BR>\n" );
document.write( ".<BR>\n" );
document.write( "-x^2+10x+5<BR>\n" );
document.write( "First group the x terms:<BR>\n" );
document.write( "-(x^2-10x)+5<BR>\n" );
document.write( "Complete square:<BR>\n" );
document.write( "-(x^2-10x+__)+5<BR>\n" );
document.write( "-(x^2-10x+25)+5+25<BR>\n" );
document.write( "-(x-5)^2+30<BR>\n" );
document.write( "So, the vertex is at:<BR>\n" );
document.write( "(5,30)\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );