document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=404648>Question 404648</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the product<BR>\n" );
document.write( "(2x-4y)(2x+4y) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #285956 by </B><A HREF=/tutors/aboutme.mpl?userid=jsmallt9><B>jsmallt9(3758)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jsmallt9><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=285956\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (2x-4y)(2x+4y)<BR>\n" );
document.write( "The slow way to multiply this is with FOIL. The faster way is to recognize that this expression fits the pattern <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28a%2Bb%29%28a-b%29+=+a%5E2-b%5E2 ALIGN=MIDDLE  ALT=\"%28a%2Bb%29%28a-b%29+=+a%5E2-b%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > with the \"a\" being 2x and the \"b\" being 4y. Using this pattern:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282x-4y%29%282x%2B4y%29+=+%282x%29%5E2+-+%284y%29%5E2+=+4x%5E2+-+16y%5E2 ALIGN=MIDDLE  ALT=\"%282x-4y%29%282x%2B4y%29+=+%282x%29%5E2+-+%284y%29%5E2+=+4x%5E2+-+16y%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "FOIL should give you the same answer but after more work. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );