document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=192028>Question 192028</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 9c^2-121 factor completely. I have no idea where to start. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #144088 by </B><A HREF=/tutors/aboutme.mpl?userid=RAY100><B>RAY100(1637)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=RAY100><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=144088\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> factoring  is  recognition  of  patterns\r<BR>\n" );
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document.write( "a^2-B^2  =  (a+b)  (a-b)  \r<BR>\n" );
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document.write( "9C^2 -121=  (3c)^2 -(11)^2= (3c+11)(3c-11)\r<BR>\n" );
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document.write( "checking  by  foil\r<BR>\n" );
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document.write( "(3c+11)(3c-11)\r<BR>\n" );
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document.write( "9c^2 -33c+33c-121=  9c^2-121 </SPAN>\n" );
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