document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=272072>Question 272072</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how do you factor each trinomial completely?\r<BR>\n" );
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document.write( "-a^2-10a+21\r<BR>\n" );
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document.write( "-x^2+9x+20 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #199127 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=199127\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> -a^2-10a+21<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"a=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a=(10+-sqrt(-10^2-4*-1*21])/2*-1<BR>\n" );
document.write( "a=(10+-sqrt100+84])/-2<BR>\n" );
document.write( "a=(10+-sqrt184)/-2<BR>\n" );
document.write( "a=(10+-13.56)/-2<BR>\n" );
document.write( "a=23.56/-2<BR>\n" );
document.write( "a=-11.78 ans.<BR>\n" );
document.write( "a=(10-13.56)/-2<BR>\n" );
document.write( "a=-3.56/-2<BR>\n" );
document.write( "a=1.78 ans.<BR>\n" );
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document.write( "-x^2+9x+20<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "x=(-9+-sqrt[9^2-4*-1*20])/2*-1<BR>\n" );
document.write( "x=(-9+-sqrt[81+80)/-2<BR>\n" );
document.write( "x=(-9+-sqrt161)/-2<BR>\n" );
document.write( "x=(-9+-12.69)/-2<BR>\n" );
document.write( "x=(-9+12.69)/-2<BR>\n" );
document.write( "x=3.69/-2<BR>\n" );
document.write( "x=-1.845 ans.<BR>\n" );
document.write( "x=(-9-12.69)/-2<BR>\n" );
document.write( "x=-21.69/-2<BR>\n" );
document.write( "x=10.845 ans. </SPAN>\n" );
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