document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=77643>Question 77643</A>: <I><SPAN STYLE=\"word-break: break-all;\"> multiply -\r<BR>\n" );
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document.write( "(2x-1)(2x+1) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #55694 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=55694\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In order to multiply terms in parenthesis, we have to foil the terms. So we multiply the first terms together to get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x%2A2x=4x%5E2 ALIGN=MIDDLE  ALT=\"2x%2A2x=4x%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Then we multiply the outer terms together <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x%2A1=2x ALIGN=MIDDLE  ALT=\"2x%2A1=2x\"   DISABLED_style= \"max-width:90%; height:auto;\" > and the inner terms <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-1%2A2x=-2x ALIGN=MIDDLE  ALT=\"-1%2A2x=-2x\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Finally we multiply the last terms <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=-1%2A1=1 ALIGN=MIDDLE  ALT=\"-1%2A1=1\"   DISABLED_style= \"max-width:90%; height:auto;\" > to finally get\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282x-1%29%282x%2B1%29=2x%2A2x%2B2x%2A1-1%2A2x-1%2A1=4x%5E2%2B2x-2x-1 ALIGN=MIDDLE  ALT=\"%282x-1%29%282x%2B1%29=2x%2A2x%2B2x%2A1-1%2A2x-1%2A1=4x%5E2%2B2x-2x-1\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "Now combine like terms\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4x%5E2%2Bcross%282x-2x%29-1=4x%5E2-1 ALIGN=MIDDLE  ALT=\"4x%5E2%2Bcross%282x-2x%29-1=4x%5E2-1\"   DISABLED_style= \"max-width:90%; height:auto;\" > Notice the x terms cancel\r<BR>\n" );
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document.write( "So <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%282x-1%29%282x%2B1%29 ALIGN=MIDDLE  ALT=\"%282x-1%29%282x%2B1%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > foils (ie multiplies) to <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4x%5E2-1 ALIGN=MIDDLE  ALT=\"4x%5E2-1\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
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