document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=348213>Question 348213</A>: <I><SPAN STYLE=\"word-break: break-all;\"> what is (x^2+9x)(x^2-9x) multiplied </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #249620 by </B><A HREF=/tutors/aboutme.mpl?userid=nyc_function><B>nyc_function(2741)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nyc_function><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=nyc_function><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=249620\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (x^2+9x)(x^2-9x) = \r<BR>\n" );
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document.write( "USE THE FOIL METHOD.\r<BR>\n" );
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document.write( "x^2 * x^2 = x^4\r<BR>\n" );
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document.write( "x^2 * - 9x = -9x^3\r<BR>\n" );
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document.write( "9x * x^2 = 9x^3\r<BR>\n" );
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document.write( "9x * -9x = -81x^2\r<BR>\n" );
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document.write( "Put it all together and combine like terms.\r<BR>\n" );
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document.write( "x^4 - 9x^3 + 9x^3 - 81x^2\r<BR>\n" );
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document.write( "x^4 - 81x^2\r<BR>\n" );
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document.write( "We now factor.\r<BR>\n" );
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document.write( "x^2(x^2 - 81)\r<BR>\n" );
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document.write( "We now factor what lies in the parentheses.\r<BR>\n" );
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document.write( "Final Answer: x^2 (x - 9) (x + 9)\r<BR>\n" );
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