document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=813549>Question 813549</A>: <I><SPAN STYLE=\"word-break: break-all;\"> (x+y-z)(x+y+z)<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #489885 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=489885\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> That is cute <BR>\n" );
document.write( "Think of it as (a-b)*(a+b) which we know =a^2-b^2<BR>\n" );
document.write( "where x+y=a z=b<BR>\n" );
document.write( "a^2-b^2<BR>\n" );
document.write( "(x+y)^2-z^2<BR>\n" );
document.write( "Now expand (x+y)^2<BR>\n" );
document.write( "x^2+2xy+y^2-z^2<BR>\n" );
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