document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=269446>Question 269446</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need to factor and solve by using the principle of zero theory\r<BR>\n" );
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document.write( "(x+3)(x-9)= -13  \r<BR>\n" );
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document.write( "Please help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #197481 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=197481\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I need to factor and solve by using the principle of zero theory <BR>\n" );
document.write( "(x+3)(x-9)= -13 <BR>\n" );
document.write( "Expand the left side:<BR>\n" );
document.write( "x^2 -6x - 27 = -13<BR>\n" );
document.write( "---<BR>\n" );
document.write( "Rearrange:<BR>\n" );
document.write( "x^2 -6x -14 = 0<BR>\n" );
document.write( "Quadratic formula:<BR>\n" );
document.write( "x = [6 +- sqrt(36 - 4*-14)]/2<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = [6 +- sqrt(92)]/2<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = [6 +- 2sqrt(23)]/2<BR>\n" );
document.write( "---<BR>\n" );
document.write( "x = 3 + sqrt(23) or x = 3 - sqrt(23)<BR>\n" );
document.write( "=========================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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