document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=168695>Question 168695</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Factor....Need some help\r<BR>\n" );
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document.write( "x^4-13x^2+36 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #124351 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=124351\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  Factor....Need some help <BR>\n" );
document.write( "x^4-13x^2+36<BR>\n" );
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document.write( "It will be (x^2 + ?)*(x^2 + ?)<BR>\n" );
document.write( "The ?'s product will be 36, and they add up to -13.<BR>\n" );
document.write( "Since it's +36, they have to have the same sign, both Pos or both Neg.<BR>\n" );
document.write( "Since they add to -13, they'll have to be both negative.<BR>\n" );
document.write( "Consider the factors of 36:<BR>\n" );
document.write( "1*36<BR>\n" );
document.write( "2*18<BR>\n" );
document.write( "3*12<BR>\n" );
document.write( "4*9, and <BR>\n" );
document.write( "6*6<BR>\n" );
document.write( "They're the same sign, so that add to 13.  If the were not the same sign, you would look at the differences.<BR>\n" );
document.write( "Only 4 and 9 add to 13, so they're it.<BR>\n" );
document.write( "It's (x^2 - 4)*(x^2 - 9)<BR>\n" );
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