document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=492056>Question 492056</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How do I completely factor the following expression 81y^2 - 4z^2  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #334908 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=334908\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Since:<BR>\n" );
document.write( "81y^2 - 4z^2<BR>\n" );
document.write( "can be rewritten as:<BR>\n" );
document.write( "(9y)^2 - (2z)^2<BR>\n" );
document.write( "This is a \"difference of squares\" (special case):<BR>\n" );
document.write( "(9y - 2z)(9y + 2z)<BR>\n" );
document.write( " </SPAN>\n" );
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