document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=75805>Question 75805</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If b and 7 are solutions to the equation x^2-4x=a. find the value of a+b. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #535661 by </B><A HREF=/tutors/aboutme.mpl?userid=JoelSchwartz><B>JoelSchwartz(130)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=JoelSchwartz><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=535661\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x^2-4x=a<BR>\n" );
document.write( "x=7<BR>\n" );
document.write( "49-28=a<BR>\n" );
document.write( "a=21<BR>\n" );
document.write( "x^2-4x=21<BR>\n" );
document.write( "x^2-4x-21=0<BR>\n" );
document.write( "ac=-21<BR>\n" );
document.write( "b=-4<BR>\n" );
document.write( "-7*3=-21<BR>\n" );
document.write( "-7+3=b<BR>\n" );
document.write( "(x-7)(x+3)<BR>\n" );
document.write( "x=7 and x=-3<BR>\n" );
document.write( "we don't use the seven because we already know seven is one of the values 21-3 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );