document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=765094>Question 765094</A>: <I><SPAN STYLE=\"word-break: break-all;\"> (x + 3y) (x - 3y) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #465972 by </B><A HREF=/tutors/aboutme.mpl?userid=lenny460><B>lenny460(1073)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lenny460><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=lenny460><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=465972\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (x + 3y) (x - 3y)\r<BR>\n" );
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document.write( "x * x = x^2\r<BR>\n" );
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document.write( "x * -3y = -3xy\r<BR>\n" );
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document.write( "3y * x = 3xy\r<BR>\n" );
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document.write( "3y * -3y = -9y^2\r<BR>\n" );
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document.write( "Therefore:\r<BR>\n" );
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document.write( "x^2 - 3xy + 3xy - 9y^2\r<BR>\n" );
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document.write( "Combine like terms:\r<BR>\n" );
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document.write( "-3xy + 3xy = 0\r<BR>\n" );
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document.write( "Answer:\r<BR>\n" );
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document.write( "x^2 - 9y^2\r<BR>\n" );
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document.write( "Lennox Obuong<BR>\n" );
document.write( "Algebra Tutor<BR>\n" );
document.write( "Nairobi, Kenya<BR>\n" );
document.write( "Email: lennoxobuong@yahoo.com </SPAN>\n" );
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