document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=245988>Question 245988</A>: <I><SPAN STYLE=\"word-break: break-all;\"> why dose <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=sqrt%284x%5E4%2B36x%2B81%29 ALIGN=MIDDLE  ALT=\"sqrt%284x%5E4%2B36x%2B81%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x%5E2%2B9 ALIGN=MIDDLE  ALT=\"2x%5E2%2B9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "and not<BR>\n" );
document.write( "=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2x%5E2%2B6x%2B9 ALIGN=MIDDLE  ALT=\"2x%5E2%2B6x%2B9\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "what happens to the 6??<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #179674 by </B><A HREF=/tutors/aboutme.mpl?userid=richwmiller><B>richwmiller(17219)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richwmiller><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=richwmiller><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=179674\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (2x^2+9)^2=(2x^2+9)(2x^2+9)<BR>\n" );
document.write( "use FOIL<BR>\n" );
document.write( "first <BR>\n" );
document.write( "2x^2*2x^2=4x^4 no,problem here<BR>\n" );
document.write( "outer<BR>\n" );
document.write( "2x^2*9<BR>\n" );
document.write( "inner<BR>\n" );
document.write( "9*2x^2<BR>\n" );
document.write( "last <BR>\n" );
document.write( "9*9=81 no problem here<BR>\n" );
document.write( "add 2x^2*9and 9*2x^2<BR>\n" );
document.write( "18x^2+18x^2=36x^2<BR>\n" );
document.write( "so we have 4x^4+36x^2+81 not 36x\r<BR>\n" );
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document.write( "{2x^2+6x+9}^2 would be 4x^4+24x^3+72x^2+108x+81<BR>\n" );
document.write( "neither work out to be 4x^4+36x+81\r<BR>\n" );
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document.write( "I suspect that you copied the original sqrt incorrectly ie sqrt(4x^4+36x+81)<BR>\n" );
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