document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=33381>Question 33381</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0618250182/algebrahomeworkh>Algebra 1</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Sum And DifferencePattern. Write the product of the sum and difference.         (y-1)(y+1)\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #19747 by </B><A HREF=/tutors/aboutme.mpl?userid=jwilliams1989><B>jwilliams1989(2)</B></A><img src=\"/images/stars/iconNewId_16x16.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jwilliams1989><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=19747\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> To solve this, use the FOIL method.  First, Outside, Inside, Last.\r<BR>\n" );
document.write( "\n" );
document.write( "(y x y) (y x 1) (y x -1) (1 x -1) =\r<BR>\n" );
document.write( "\n" );
document.write( "y^2 + 1y - 1y -1\r<BR>\n" );
document.write( "\n" );
document.write( "Because you can cancel out the 1y and -1y you are left with Y^2 - 1 or Y squared -1.  Hope this helps.\r<BR>\n" );
document.write( "\n" );
document.write( "Jonna\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );