document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=173894>Question 173894</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need and explanation for two questions I posted up for help yesterday. Answers and steps were given but the answers didn't appear to be correct:\r<BR>\n" );
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document.write( "Both of these say Factor Completely:\r<BR>\n" );
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document.write( "12x^2 + 13x +3. The answer is (4x + 3)(3x + 1) But I do not understand we got 13 x out of 3 and 3x?? Wouldn't that be 9x?? \r<BR>\n" );
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document.write( "And the second is exactly the same:\r<BR>\n" );
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document.write( "16x^4 - 40x^2 + 9. The answer was given as (4x^2 - 1)(4x^2 - 9) which can further be factored, I understand.But ok same question, since when does 1 . 4x^2 equal 40x^2? That would be 4x^2? Can someone please explain to me the step I am missing because I really feel like I am finally getting this stuff and then WHAM!!! Thanks for the help;-) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #128772 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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/cgi-bin/show-face.mpl?user=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=128772\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Expand through \"FOIL\" (first, outer, inner and last)<BR>\n" );
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document.write( "(4x + 3)(3x + 1)<BR>\n" );
document.write( "First:  4x(3x) = 12x^2<BR>\n" );
document.write( "Outer: 4x(1) = 4x<BR>\n" );
document.write( "Inner: 3(3x) = 9x<BR>\n" );
document.write( "Last: 3(1) = 3<BR>\n" );
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document.write( "Putting it all together we have:<BR>\n" );
document.write( "12x^2 + 4x + 9x + 3<BR>\n" );
document.write( "12x^2 + 13x + 3<BR>\n" );
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document.write( "The second expansion works the same as above.<BR>\n" );
document.write( "For review of FOIL see:<BR>\n" );
document.write( "http://www.mathwarehouse.com/algebra/polynomial/foil-method-binomials.php<BR>\n" );
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