document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=592787>Question 592787</A>: <I><SPAN STYLE=\"word-break: break-all;\">  I don't understand how to do problems that include three or four problems together such as x^3+5x^2-16x-80 can you help or explain<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #376058 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=376058\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I don't understand how to do problems that include three or four problems together such as x^3+5x^2-16x-80 can you help or explain.<BR>\n" );
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document.write( "Usually, but not always, problems like this with 4 terms are set up so you can factor the expression by a method called grouping:<BR>\n" );
document.write( "x^3+5x^2-16x-80<BR>\n" );
document.write( "Group terms to get a common factor<BR>\n" );
document.write( "=x^2(x+5)-16(x+5)<BR>\n" );
document.write( "factor out common term (x+5)<BR>\n" );
document.write( "=(x+5)(x^2-16)<BR>\n" );
document.write( "expand difference of squares<BR>\n" );
document.write( "=(x+5)(x+4)(x-4) </SPAN>\n" );
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