document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=789207>Question 789207</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Factor each of the following completely.\r<BR>\n" );
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document.write( "x^4-81y^4 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #478764 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=478764\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Apply the difference of squares rule (twice) to get \r<BR>\n" );
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document.write( "x^4-81y^4\r<BR>\n" );
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document.write( "(x^2)^2-(9y^2)^2\r<BR>\n" );
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document.write( "(x^2-9y^2)(x^2+9y^2)\r<BR>\n" );
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document.write( "(x^2-(3y)^2)(x^2+9y^2)\r<BR>\n" );
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document.write( "<font color=\"red\">(x-3y)(x+3y)(x^2+9y^2)</font> </SPAN>\n" );
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