document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=6435>Question 6435</A>: <I><SPAN STYLE=\"word-break: break-all;\"> please help with this problem.<BR>\n" );
document.write( "Factor completely.\r<BR>\n" );
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document.write( "x^2 + 4xy - 21y^2<BR>\n" );
document.write( "thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #3470 by </B><A HREF=/tutors/aboutme.mpl?userid=sabanasir><B>sabanasir(22)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=sabanasir><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=3470\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">    x^2 + 4xy - 21y^2<BR>\n" );
document.write( "=> x^2 + 3xy - 7xy - 21y^2<BR>\n" );
document.write( "=> x (x+3y) - 7y (x+3y)<BR>\n" );
document.write( "=> (x+3y)(x-7y) </SPAN>\n" );
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